depends on your company, WX, how you do, amount flight time you get on your trips, how fast you go from checkride to first IOE flight... variables variables variables...

2-3 weeks average.

Good luck! IOE trips are the best trips you will have for the next while, so enjoy them!!!

*EDIT: 2-3 weeks average is from end of sim to END of IOE. And that is assuming you start IOE within 4 days or less of your sim checkride.