Flamestrike
Legend
Again this "you the DM let it happen, so it's your fault" shaming.
Then dear Banana please explain how to run, say, the recent official adventure Out of the Abyss.
It features travel times measured in weeks. Its guidelines result in zero, one or two encounters per day, roughly half of which is interesting terrain only (no creature interaction).
It also features lots of mini dungeons that have many encounters 1 after the other yeah?
No-one is saying 'only every stick to the 6-8 encounter Adventuring day'. Like I said, aim for around 50 percent of the time. Build it into your adventures (with the occasional longer AD, and the occasional single encounter AD).
For the above adventure (or one similar to it, where you mostly only get the one or two encounters per day max) I would simply use the 'longer rest' variant from the DMG (possibly switching to the shorter rest variant in more densely packed areas of the module).
The truth is that LOTS and LOTS of D&D scenarios, official or otherwise, map incredibly poorly to this X encounters a day expectation. The DMG guidelines are tailor-made to the "standard" dungeon delving experience.
If that's not what your adventure offers, you're SOL.
Thats not true at all. The DMG also offers rest variants that cater for just such campaigns.