Once on the ground though you are probably in a "no despatch" situation.
Don't know about the 737/320 but the 330/340 can go for upto 10 flts with a crack in the outer layer, 747-200/400 1 flt only. Upto the Capt of course, I have dispatched about 3 or 4 in 20+ years with a cracked windscreen.