How much do tech suits benefit a new Masters swimmer?

I am a new Masters swimmer, 48 years old, who will be competing in my first meet on March 27 & 28. I haven't competed since 1979 and wasn't that fast then (100yd breaststroke 1:19.6). I don't know my current 100yd breaststroke time, however, my timed 50yd breaststroke diving in from the edge of the pool (no blocks available) was :42. It has been suggested to me in another thread that I purchase a tech suit for meets. How much time will this save me in short races? I am on a budget and would like use my Speedo Endurance Training suit I purchased on clearance, at least until I get better! Thanks!