Commuting distance recommendations

Hey everyone!

Just got my new eBike (a Class 1 hardtail MTB, but I've put some slicker tires on it for urban use) and I'm looking to start commuting more regularly. My office is about 15 miles away, mostly flat with a few small inclines, and I'm wondering what kind of distances you all comfortably tackle on your eBikes daily? Do you find there's a sweet spot for range before battery anxiety or just general fatigue kicks in? Keen to hear your experiences!