Commuting distance recommendations

Hey everyone!

I'm curious to hear about your eBike commuting experiences, especially regarding distance. I've been thinking about extending my commute from 8 miles to about 15 miles each way on my Class 1 hardtail, which involves a few decent hills. What do you all consider a comfortable or "doable" daily commuting distance on your eBikes, factoring in battery life, terrain, and your own energy levels? Any tips for longer commutes would be awesome too!