I guess I could sell my car and commute entirely by ebike 30 miles a day. I'd technically make it eight weeks if I did that. Wouldn't even lose my trailer! Might even be able to eat!
Like, kind of? That's both ways, so 15 miles one way means I could use a decent level of pedal assist. Regulations mean my ebike can't go faster than 25mph, but as long as I'm not on the highway that's fine.
Also, I'd be taking mostly farm-to-market routes. Lots of 35mph roads, mostly gravel (fortunately I have mountain bike tires and shock absorbers so gravel isn't really that bad). I've done this a few times, but doing it every day... forever because I sold my car would be seriously challenging. Especially in bad weather! I'm in Iowa, it snows tons out here!
Not just a time invesent -- if you're biking 18 miles you're going to need a shower where you're going, or you're going to need a job where you can show up drenched in sweat.
And that's not factoring in rain or snow or having to transport large objects or people.