I have to last b/c my first 2 births were singletons (followed by my twins) and my situations are almost identical to yours!
1st baby: 9 hours 45 minutes from the very start (she was malpositioned so 4 of those hours were spent pushing - she could have been born *much* faster)
2nd baby: 90 minutes start to finish, unexpectedly unassisted b/c she came so fast (the mw arrived about 10 minutes later)
The twins: From first contraction to birth, 41 minutes for Baby A and I'm certain he would have come faster had I allowed it. I held out for my dh to get home from work and refused to enter the birth tub until he did. I knew that as soon as I got in that baby was coming out and I was right! There was a short break between his birth and contractions for Baby B but I'm not sure how long. Regardless, he was born 2 hours & 32 minutes after Baby A's birth.
Fwiw, they were all born at home.
Mama to four remarkable kiddos, all born at home.