Length of Time for Online Live Auction Drafts (Fantrax or Other Platforms)

Can anyone share how long their league's live online auction drafts take? And also if you have any time-saving strategies, that would be really helpful too.

I'm starting a league on Fantrax with 10 teams and 30 players per team (300 total players). We would love to do an auction draft instead of snake, but I am concerned that it is going to take too long (4 hours or more). If we could find a way to finish in about 3.5 hours max, I think that would be fine for everyone.

Thanks in advance!