Q: How long can I stay?

Oh wow ok from having one or two horrible days today really paid off!!!
But there's just one question I have ok so like I'm at my uncles or so they said he was my uncle and we went to the movies had a great dinner and stuff!!! But the question is how long can I stay I want to ask but I think it might sound rude and I dont want to come off that way with a family member I JUST met! what do I do whats my limit of how long I can stay?