Nia [She/Her]

With a free apple account which I assume most will be using you have to resign at least once every 7 days as you said. You can only sign 3 apps at a time including your side loading store if you choose to manage it from your phone. Paid Apple Dev account is more (unlimited?) apps at a time with 365 day re-signs, but $100 a year, which at that point unless you’re actually making apps isn’t worth it.

There’s a few different methods, but I prefer to use AltStore. You sideload the altstore app onto your phone from the PC installer (windows or Mac), then you let the “AltServer” run on your pc 24/7.

When your phone is on the same WiFi network as the PC, or wired over usb, it’ll automatically reinstall and re-sign your apps once they get close to expiring. You can also only install apps when on the same WiFi as altserver or over usb connection to your pc. It can sideload from repos or files directly.

There’s also a way you can use on some specific iOS versions that don’t need to be re-signed at all without having to jailbreak either but I can’t remember the name of it at all, it’s very specific versions and relies on a major exploit that apple fixed