FileVault optimizing... 43 days remaining

My FileVault says that I have to wait for 43 days for it to finish optimizing something. As soon as I launch any application it stops working. So the only time that I can dedicate for the FileVault to finish optimizing is 8-12 hours of night which makes 43 days in reality 86 days. The readings are always jumping, one time you might see 3532 days remaining but never goes below 20 days.

Maybe someone has stumbled upon this problem previously? How to speed things up, I can't wait for 3532 days for the optimization to complete that looks nonsense...

EDIT

Ok, I've waited for few days, here's how the picture is looking now:

I can't wait for 3526 days, that's almost 10 years by the way, so how do you speed things up?

EDIT

My disk drive capacity is 498 gigs, 68 gigs are unused, I have verified file system health with Disk Utility (did that in recovery mode)