It all depends on how often and situations the kit is used. I tend to pay as much attention to the tuning of the reso heads as I do the batter heads. Aside from actual physical damage to the reso head, because of the air percussion against the reso head from hitting the batter, they do need attention and can stretch a bit from normal playing. To see this happening have someone hit the batter of your bass drum and then watch your reso head. The air percussions have a definite affect on the opposite head.
I usually change my reso heads on my toms and snares about twice a year. If for some reason I don't use a particular kit very often, then they get changed once a year. Resonant heads are just as important to the sound of your drums as is the batter heads, particularly if your after that open resonant sound that clear heads can deliver.
Another rule of thumb is to change your reso head every third change of your batter head. I never really knew the meaning of the statement "rule of thumbs"..
This is what I do, hope it helps.
Dennis
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