People say 5-6 but some riders will go longer depending on how hard the tire is/isn't. Tires age when they're heat cycled, so the new tire I showed the date code from is still new although it's almost 2 years old.
Depending how your tires are for your riding style, maybe think about replacing them next spring. If they start slipping in the rain maybe sooner, but not everyone rides in the wet or the cold.
I've heard some tires are out of stock and others are just hard to find, so maybe start shopping? I bought from
www.compacc.com they had what I wanted, I thought it was a good deal and I got them in 8 days.