How LONG are you giving yourself to make your startup work? (I will not promote)

I haven't been able to build a successful startup in less than 7 years. My current one is going on 13. I hear a lot of "I'm giving it a year or so" and I'm thinking "OK well then you're pretty much guaranteeing failure because it takes way longer than that to possibly be successful." I'm curious what folks expectations here are on how long they expect to keep working on their startup before they decide whether or not it's working? Really interested to hear where those timeline expectations are coming from.