A.T. Robertson Commentary Acts 2:15

"For these are not drunken, as ye suppose; seeing it is [but] the third hour of the day." — Acts 2:15 (ASV)

As ye suppose (ως υμεις υπολαμβανετε). Note use of υμεις (ye) for decided emphasis.

The third hour (ωρα τριτη). Three o'clock in the day Jewish time, nine Roman. Drunkenness belongs to the night (1 Thessalonians 5:7). It was a quick, common sense reply, and complete answer to their suspicion.