I just read this question about long rests being regularly interrupted and this one about how resources are recovered at the end of an interrupted long rest, and another question came to me.
Is the 1-hour limit for an interruption for a long rest the total limit of all interruptions, or is it the limit for each interruption?
I'm a very beginner to the D&D system, so it might be something written somewhere that I haven't found (at least not in RPG Stack, the Basic Rules, and the rules provided in the Starter Set).
I know it might not be usual to have multiple interruptions for a single long rest, but consider the following scenario: A party takes a rest near a goblin hideout. Goblins notice the fire, so they send out scouting groups who get killed - then they send another group to search for the first group after a few hours.
If each encounter lasts for 40 minutes (which is very long, but ignore that for now), does the party have to restart their long rest after the second attack, as the total interruption was for more than one hour? Or can they just resume the rest, as each encounter was less than 1 hour?
If such a long fight seems unrealistic, then consider a different example. Try to imagine a first fight that lasts 10 minutes, and then another interruption. For example, maybe the party is camped under a big cliff, and some rocks fall onto their tents. Thus, they have to fix the damage and remove the rocks to resume their rest (which may take 55 minutes to do, bringing the total time of the interruption to over an hour).
It's not actually the interruption that interests me, or even the possibility that there can be multiple interruptions during the rest - but whether multiple interruptions whose total time is more than 1 hour breaks the rest.