For these are not drunken - The word these here includes Peter himself, as well as the others. The charge doubtless extended to all.
The third hour of the day - The Jews divided their day into twelve equal parts, reckoning from sunrise to sunset. Of course the hours were longer in summer than in winter. The third hour would correspond to our nine o'clock in the morning. The reasons why it was so improbable that they would be drunk at that time were the following:
(1) It was the hour of morning worship, or sacrifice. It was highly improbable that, at an hour usually devoted to public worship, they would be intoxicated.
(2) it was not usual for even drunkards to become drunk in the daytime, 1-Thessalonians 5:7, "They that be drunken are drunken in the night."
(3) the charge was, that they had become drunk with wine. Ardent spirits, or alcohol, that curse of our times, was unknown. It was very improbable that so much of the weak wine commonly used in Judea should have been taken at that early hour as to produce intoxication.
(4) it was a regular practice with the Jews not to eat or drink anything until after the third hour of the day, especially on the Sabbath, and on all festival occasions. Sometimes this abstinence was maintained until noon. So universal was this custom, that the apostle could appeal to it with confidence, as a full refutation of the charge of drunkenness at that hour. Even the intemperate were not accustomed to drink before that hour. The following testimonies on this subject from Jewish writers are from Lightfoot: "This was the custom of pious people in ancient times, that each one should offer his morning prayers with additions in the synagogue, and then return home and take refreshment" (Maimonides, Shabb., chapter 30). "They remained in the synagogue until the sixth hour and a half, and then each one offered the prayer of the Minchah before he returned home, and then he ate." "The fourth is the hour of repast, when all eat." One of the Jewish writers says that the difference between thieves and honest men might be known by the fact that the former might be seen in the morning at the fourth hour eating and sleeping, and holding a cup in his hand. But for those who made pretensions to religion, as the apostles did, such a thing was altogether improbable.

But the third hour of the day - That is, about nine o'clock in the morning, previously to which the Jews scarcely ever ate or drank, for that hour was the hour of prayer. This custom appears to have been so common that even the most intemperate among the Jews were not known to transgress it; Peter therefore spoke with confidence when he said, these are not drunken - seeing it is but the third hour of the day, previously to which even the intemperate did not use wine.

For these are not drunken, as ye suppose, seeing it is [but] the (i) third hour of the day.
(i) After the sunrise, which may be about seven or eight o'clock to us.

For these are not drunken,.... Meaning not only the eleven apostles, but the rest of the hundred and twenty, on whom also the Spirit was poured forth, and who were endowed with his extraordinary gifts:
as ye suppose; and had given out that they were: and this shows the sense of being filled with new wine; that they meant that they were really drunk, and which they believed, or at least would have had others believe it; the unreasonableness of which supposition and suggestion the apostle argues from the time of day:
seeing it is but the third hour of the day; or nine of the clock in the morning: for till this time it was not usual with the Jews, if men of any sobriety or religion, so much as to taste anything: the rules are these (h),
"it is forbidden a man to taste anything, or do any work after break of day, until he has prayed the morning prayer.
Now
"the morning prayer, the precept concerning it is, that a man should begin to pray as soon as the sun shines out; and its time is until the end of the fourth hour, which is the third part of the day (i).
So that a man might not taste anything, either of eatables or drinkables, until the fourth hour, or ten o'clock in the morning: hence it is said (k), that "after they offered the daily sacrifice they ate bread, , "at the time of four hours":
or on the fourth hour, and sooner than this it was not lawful to eat, even ever so little; and whoever did, was not reckoned fit to be conversed with,
"Says R. Isaac (l), whoever eats a green or herb before the fourth hour, it is forbidden to converse with him; and the same says, it is unlawful to eat a raw herb before the fourth hour. Amemar, and Mark Zutra, and Rab Ashe were sitting, and they brought before them a raw herb before the fourth hour. Amemar and Rab Ashe ate, and Mark Zutra did not eat: they said to him, what is thy meaning? (he replied) that R. Isaac said, whoever eats a herb before the fourth hour, it is forbidden to converse with him.
The time for taking food by persons of different characters, is thus expressed by them:
"the first hour is the time of eating for the Lydians, the second for thieves, the third for heirs, the fourth for labourers, the fifth for every man; is it not so? Saith R. Papa, the fourth is the time of repast for every man; but (the truth is) the fourth is the time of eating for every man, the fifth for labourers, and the sixth for the disciples of the wise men (m).
Hence that advice (n),
""at the fourth hour", go into a cook's shop, (or tavern,) if thou seest a man drinking wine, and holding the cup in his hands, and slumbering, inquire about him, if he is one of the wise doctors, &c.
The "gloss" upon it is,
"at the fourth hour, for that is the time of eating, when all go into the shops (or taverns) to eat.
Now whereas they that are drunken are drunken in the night, and not in the day, and much less so soon in the day, when it was not usual, at least with religious men, to have tasted anything by this time; and whereas the apostles, and their company, were sober and religious men, and had never done thing to forfeit their character, it was unreasonable to suppose anything of this kind in them,
(h) Maimon. Hilch, Tophilla, c. 6. sect. 4. T. Bab. Beracot, fol. 28. 2. (i) lb. c. 3. sect. 1. Vid. T. Beracot, fol. 26. 2. (k) Targum in Eccl. x. 17. (l) T. Bab. Betacot, fol. 44. 2. (m) T. Bab. Sabbat, fol. 10. 1. (n) T. Bab. Bava Metzia, fol. 83. 2.

these are not drunken--meaning, not the Eleven, but the body of the disciples.
but the third hour--nine A.M. (see Ecclesiastes 10:16; Isaiah 5:11; 1-Thessalonians 5:17).

These are not drunken. It was only the third hour, nine o'clock. The Jews at their festivals seldom ate before this hour, and as their drink was taken at a meal, could not be drunken.

It is but the third hour of the day - That is, nine in the morning. And on the solemn festivals the Jews rarely ate or drank any thing till noon.