Average length of sex

As the headline suggests. How long does it take for a man to cum? My other half is worrying he’s taking too long. He’s pretty inexperienced I’m only his second sexual partner and he’s a lot older than me, but I can’t find any decent reliable website which has an average time. So I was wondering if you could help me out and tell me how long you and your SO have sex for. I’m sorry if this comes across as rude or nosy I’m just trying to relay his fears. ❤️