Changing batter heads
The drumhead that should be changed most often is the one for the snare drum, because it is the most played of the whole kit. In the case of a sanded drumhead, it is when the grainy effect of the drumhead disappears that it is recommended to change the drumhead. As a general rule, it is necessary to change the drumheads quite regularly when you play frequently, because the drumhead loses its elasticity due to the tension and intensive hitting. Then the sound becomes duller and the bounce less precise. But it all depends, of course, on your playing style... The more you play softly and lightly, the less you wear out your drumheads!
Some tips to keep your drumheads longer
Check that your drumheads are properly tuned before each session. Avoid playing with loose drumheads, as this makes them considerably more fragile. Don't tilt your toms too much, this will avoid the creation of bumps and holes caused by the impact of the drumstick tips
Choose quality drumheads; although slightly more expensive to buy, they are more economical to use because they are more efficient in the long run
Changing the resonant heads
Yes, although the drumhead does not suffer from the direct impact of your drumsticks, it still works mechanically with each stroke. In permanent tension, the drumhead also loses some of its original qualities, over time. It is therefore strongly recommended to change your drumheads every 2 years.