My 2015 tax return is at work. I cannot access it until Monday. If I close Turbo Tax now, will I lose what I have entered? I am finished except for entering last year's

No turbo tax saves all entered information and you can start where you left off the next time you log in

true...but if you're in the middle of some form entry, it may not get exactly back to the exact same spot...try to finish one form, and get back out to the menu page before you save and log out.

That is correct alway finish the page you are on first before exiting as it may not save a half finished form