How long can I get in the hot tub @ 27 weeks preg?

How hot is the tub? The problem with getting in a hot tub is that if it is really hot (often they are 104 Fahrenheit) then it can give you a fever and this is bad for the fetus. Best just to avoid the tub or take a short dip, 5-10 mins.
Not long! Your body temperature should not be above 102.2 There is no absolute rule about temp or time, but experts say not more than 15 minutes and don't get too hot! See http://www.davinciiobgyn.com/health-library/hw-view.php?DOCHWID=tn9082.