I believe it's 15/23. It might be 16? It's averaged over the season. And it's not a law, you just get some money if you do.
Typically we'd be looking at:
Harris/Chester, Taylor + Cruse, Brookes
Gaskell + Launch + Rowlands/Flament/Matthews (think he's technically eqp).
Shields/Wills
Robson + A N Other
Umaga/Searle
2 wingers + bench 23
So by my reckoning we're probably going to be rather close each week, but can likely push our numbers right up during the challenge cup (fairly sure that counts).