About how long does a 3 week old baby stay awake at one time?

My daughter does about15-20 minutes and goes back to sleep

@mimiz, my son usually stays up for like 30 min.. but all of a sudden he stays up for like 2 hours

Oh wow no I haven't gotten there yet lol he isn't crying or anything right?

@mimiz, only when he's wet or hungry besides that nope

Oh well I mean I wouldn't worry to much as long as he actually gets some sleep