If you have future plans to go active, then okay. But there may be a time limit on how long you can be inactive before PADI requires retraining. I don't know what that is, though.
Provided you maintain PADI membership and receive material updates there is no time limit. In fact PADI probably has no way of knowing whether you are insured and teaching or not.
If your PADI membership has lapsed then it will depend on how much the standards have changed since you were last a member. You may just need to do an update or you may need to redo the DM course over.