Hopefully quite a while. I’m regularly in the wilderness, a holiday is 2-3 weeks off-grid. The only thing I use electricity for is lighting (torches and camp) and music/radio, powered off battery’s that are handled by solar.
I aim to extend food by fishing, which usually is week 2 after my stored meat is gone and I need more protein. I have a couple of different weighted bows, but rarely hunt as it requires extra licensing. Lots and lots and lots of expedition-level outdoor/survival gear.
Combine that all with still having a house for shelter, should be fine. Love a book and crosswords for non-electric entertainment, otherwise mountain biking or rock climbing. I won’t get bored.