I had a couple of small tears which were stitched after DD2 was born. The MW did tell me how long it would take before the stitches would dissolve but I have forgotten (why do they bother telling you stuff after you've given birth & your brain is so addled?)
Presumably once the stitches have gone I should be fairly well healed? But how long should you wait before having sex again? After DD1 I told DH that I wasn't even considering it until I'd stopped bleeding, but DD2 was 3.5lb bigger than DD1, so I'm thinking it might take a bit longer to recover this time?!!