11.6
11 whole eights, with 6 left over. The 6 will make 3/4 of another eight.
1/32 eights make one fourth.
What pressure is available? What size orifice , How long are people in the shower? 1 minute or several hours? This question is like asking "how fast can a car go" without knowing HP etc..
How many litres of water does it take to take a shower
9.4 m = 940 cm