How long does it really take for a guy to move on?

My ex broke up with me 4 days ago and I want to fix the relationship we had before and they always say give a guy space and if he comes back it's ment to be if he doesn't let it go and that's what I'm doing but I just have this sick feeling that he's already over me and he's out there ya know getting laid but I can't think that way bc he's a single man now he can do whatever he wants.
Updates
1 y
I did reach out to him only once to ask him about his shirt and he did Reminisse how he wanted to start the building blocks of a family with me and this is why it sucks, he told me goodnight and please leave him alone for a while.
How long does it really take for a guy to move on?
Post Opinion