Cap'n Kobold
Hero
It sounds like you might be aiming for around a week of activity between long rests. Ish.During tier 1, say 2-5 encounters between long rests, with 1-3 encounters between short rests. And there very well may be days without encounters - exploration and all that. So that would be adjacent short rests that I'm not counting above. So for example it might be a five day trek to get to safety they can take a long rest, with day 1 being no encounters, day 2 being one, day 3 with three, day 4 having none, and day 5 having one.
After tier 1, when they can go further, I will encourage 4-10 encounters between long rests, with 2-4 encounters between short rests. Again, with the possibility of no-encounter days so that there are back-to-back short rests not counted above. If they go too long, I will surprise them with something like a druid's sanctuary or "the perfect sunrise over the cliffs - your short rest counts as a long one" or other DM slight of hand.
Considering daily item recharges and the like, those blank days would really impact. I think I might make them recharge on something like the three days of the full moon and three days of the new moon or once a ten-day or something like that. I like the asymetrical moon one even though I just came up with it. It's both enough recharges to bring stuff back to full unless you roll really bad, but also something you can time to doing a specific activity so it recharges during that.
Regarding item renewal, you could do a couple of things:
Currently charged items generally recover dx+1 charges per dawn. You could change that to them getting only one charge per day. That would make items with less charges more powerful however. (Although you could double/triple both charges and costs to counter this.)
Alternatively perhaps double the charges in an item, and the amount recovered, then have them renew every new moon. (28 days if same as Earth's. If you're in Eberron, just pick one.

Make them bound to long rests, the same as PC recoveries. A Druidic staff has to be planted in the open air for a week for example.
Or have them actually take resources: The item can only be recharged by the person attuned to it spending Hit Dice over the course of a long rest.