How long before expiration do you renew your names?

On important names, a couple of months, on less important, about one month…

3 to 4 weeks on names I’m sure to keep.Go up to the last day on some that I am not sure of dropping.

usually several days before expiration.

Usually about a week before expiration, most (maybe all) add the remaining time onto the extra year or whatever you pay for anyway, so no point hanging on if you dont need to.