I just finished watching Bromance and in the show a woman on a bus gives birth in what feels like 30 seconds. She was just sitting around acting normal then all of a sudden contractions start and I guess she's fully dilated because she can't be moved from the bus and has to give birth on the nasty floor.
It's been a while but I specifically remember in Fated to Love You (TW) three women go in to labor at exactly the same time and again deliver just really quickly, I'm pretty sure it's outside in a park.
To be fair these are comedy dramas, they aren't going for ultra realistic in anything, but its just crazy how FAST everything happens.