Yeah, my mock bid gave me 17 days off and credited 77 hours.
There's usually only 1 or 2 17 day off lines in the Line Bids per month in DTW. On top of that, I only get awarded lines half the time, and mathematically I'm outside of a line altogether.
So no, I don't believe mock bids accurately represent life for 1 second.
To be fair, it is good practice, and I fully understand that's all it really is. As someone who's never used PBS, I need it!