I carry a plug kit and compressor. As for how long it will last, well,,,,,,,,,,,How old is the tire? What sort of carcass damage done riding it flat?, Does the repair have a good hold and plenty to hold to?, how confident are you on the repair?
If it were pretty new, I'd not have a problem riding it to the end of it's life. I would replace it if it were even close to half done, had to be moved while flat, or the hold didn't feel right to me.
Since you are asking, rode it flat, and only have 2 wheels, get a new shoe. Had you been able to repair it right then and the carcass of the tire were good, and the repair in the tread portion not angling to the side walls, then I'd say you were good.
You have to answer all that for you, and since you are asking and have more than just one question to the condition, I would get it replaced. I also did just that a couple of weeks ago because of the age of the tire. The plug kit gets you to civilization. The rest is up to you.
Some people go their whole life wondering if they made a difference, Marines don't have that problem.~ Ronald Reagan
2012 XCT, AFR+ Gen 4, Lloydz air filter. I don't equate noise with power.
I ride with the Force.