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@Dooks-Fatberg
When they go rattly, microphonic or stop working. If they're working and aren't making weird noises, just play until you need to address an issue. Depending on abuse levels, it could be years.
Alternatively you can change them whenever you fancy tinkering about with trying new ones.
When i played out several times a week i'd change tubes all the time. Now i'm just a home player I tend to retube with decent quality glass when i get a new amp, keep whatever was in there as spares and forget about it. My Champ hasn't needed a tube changed in 10 years.