hell on the internet if a guy isn't giving his girl at least a dozen orgasms every time they fuck and he lasts less than an hour before cumming then he's pretty much a failure and should give up sex because he has no hope. duhh
it goes like this, you take your very best sexual performance you've ever had (or a friend of yours had, or you heard about, or can realistically imagine) multiply the number of times the chick got off by 12 (if she didn't get off at all then she had one (1) real orgasm by default so a dozen internet orgasms) then add or subtract a random amount from 1 to 6 (a dice roll is the approved method for obtaining the number followed by flipping a coin for plus or minus, heads for plus, tails for minus). for time you take the longest you've lasted multiply by 4 and add or subtract a random amount from 1 to 6, again obtained by a dice roll (note: if you've never lasted longer than 15 minutes then you just use 15 by default, also if you're using someone else's sexual experience to obtain your internet sex prowess obviously you use their time to ejaculation). the result of this process then becomes your AVERAGE INTERNET SEXUAL PERFORMANCE!
or you can just be realistic if you're comfortable with yourself.