Not a girl, but I have taken 4 men back to back, and it took over an hour. I felt stretched, and didn't have to push hard to get the cum out. But, next day felt fine. Would love to do that again.
I am not a girl but I can tell the first time I fucked my then girlfriend - it took some warming up - she said it was SO good she wanted a DP. Warming up is the thing!