In commute hours (6:30-9:30AM) 45-60 minutes. Same in reverse from 3:30-6PM. Even though they open 2 tunnels in the commute direction it still backs up. The 4th bore is 2 years away so maybe that will help alleviate some of the pressure.
Other times of day not so bad 30-35 minutes
Sometimes the part that gets me is when you are "reverse commuting" and on the side with 1 tunnel open the backups can be just as bad.
Hope that helps,