if you've been manually doing 5s turns, that's unnecessary - start stepping it up
Judge the time intervals based on what you are doing. The game will interrupt on new contacts and new IDs. You are generally safe with decently high intervals on that basis with one important exception. If both sides have detected eachother - or if one side has short range passives and actives off - it is possible for an inappropriately long interval to deposit a whole group of NPRs right in your face.
It's also possible for some missile salvos to stack up and magically fly through your PD, though that is rare and I'm not sure what causes that. Probably bad sub-intervals counts. If missiles are in flight from either side, stick to intervals of 1-5 minutes at most, then slow it down once the missiles are detected.