i always thought the more you had the easier it got and for me this was the case till number 6
ds 1 4.5 hours
dd 1 3.5 hours
dd 2 1.5 hours
dd 3 28 mins
dd 4 50 mins
dd 2 4hours and 48 minuets but he was breech so maybe that made the differanve not sure
but the whole recovery time and looking after bub was eaisier but i think that is mostly a confidence thing more then the work got easier