Five months for a bathroom? Wow. Your boss is much much nicer than mine.
The important thing to remember is that drywall is only a cover. It covers up a lot of flaws.(ask me how I know
)
If there's not
-proper structure under the tub,
-or drains are not hooked up and the water turned on(pure negligence),
-or green sheetrock not used with proper flashing around,
-or sealed insulation.....
These can turn into warped floors, leaks and/or mold!
Get that drain hooked up and fans for ventilation in the crawlspace ASAP.
Spray everyhting down with bleach solution and wear a good carbon chemical mask.