seller financing land contract duration?

[Mikey Cas]

I am thinking about going through seler financing with a property, I feel it would be advantageous for my situation. I know it varies for every property, but is it typically the same as having a conventional mortgage, except you dont go through a bank, the payments go to the seller? Would a 30 year loan through seller financing be typical? Or do they only want payments for a few years. Thanks