I'll go off my mum's I only really know the times she left for hospy and when we were born, though...

Me: Around 5 hours, 10 days early, average size
Brother 1: About an hour , 6 weeks early, got FAT reeeeeally quick for a premmie
Brother 2: 3 hours (ish), 11 days early, teeny tiny little bugger (he's still tiny and we tease him for it )