How soon after a tooth cuts does it come fully out?

B

My son turned 6 months a few days a go and right on schedule has cut his first tooth.

The picture isn’t perfectly clear but you can see that it’s just broken through the gums and the tooth next to it is close too.

My son is still in pain and I’m wondering how long it’ll take before the tooth is fully out as I really hate seeming him in pain and upset!!