Ebikes make such a distance very easy. A friend of mine lives on the edge of Berlin (Friedrichshagen) and his commute is a full hour with an e-bike. A bit over 20 kilometers.
I walk to work these days. Much more relaxing and I listen to podcasts. I don't mind if it takes a bit of time. Anything up to 5, 6 kilometers is fine with me. I gave up my bike last year (I was renting one) as I don't need it anymore.
The issue with biking in Berlin is similar to what the Amish in this article are experiencing: it's dangerous. Traffic is not well adjusted to bikes and city planners keep producing these crazy traffic situations with their ineptness. Construction sites. Buses that have to cross the bike lane to the bus stop, etc.
And that's before you consider that the rule that Germans love rules has one giant exception: traffic rules. Jumping a red light. Not a problem. It was orange a second ago and who can tell the difference? Taxis driving 90 in a 50km zone (i.e. the city limits): happens constantly. 30km speed limits? More of a guideline and those signs are used very sparingly. Speed cameras are science fiction. I've never seen one in Berlin.
I've seen several, but they are carted around and look like some trailer parked innocently on sidewalk, I was curious about one "futuristic" looking trailer thinking it was maybe a bike garage or something but after careful observing it was indeed a speed camera.
> 30km speed limits? More of a guideline and those signs are used very sparingly.
Yeah, unless they are near school zone. Then they are almost invisible and you have a radar with flash to make sure that you know you are speeding.
There are more outside Berlin. I drove one road where it had a side road every 1km or so. And of course constant 60-80-60-80-60 signs. And a radar exactly there where you finally said "fsck it" and didn't slow at that next 60km/h.
I wouldn't do it in the dust and exhaust of Stockholm, and American cities have even more dust an exhaust.
This is the key to encouraging Active Travel. So much infrastructure is designed primarily for motor traffic and provision for cyclists tends to be just tacked on and not really thought about in any depth.
One big problem with cycling is when you get a road with lots of light-controlled junctions that makes you keep stopping and starting - the loss of momentum can turn an easy ride into an exhausting one. It's particularly galling when you can see that there is room for cyclists to safely go through a red light (c.f. Idaho Stop style laws) and so you have to decide between being a law-abiding citizen of the road, or instead treat red lights as advisory. Sometimes, it's even worse than just slowing you down as junctions can be quite dangerous if you're setting off at the same time as motorists - I aim to anticipate the lights changing and get a brief head-start so that I can be highly visible in front of the drivers and across the junction before anyone has a chance to turn across me.
It's also how dirty/sweaty you get on the ride. In the USA, bike showers are a rare amenity from employers.
My last employer said they had showers for bikers, which seemed like a great amenity, until I actually looked at them -- the shower room was down a little used utility corridor that was only unlocked during 8-6pm business hours, so if you got to work before or after that time you couldn't get in. There were no lockers, so you couldn't even leave a wet towel there for the day, you had to take it up to your desk.
I had a 14 mile ride to work, 90% on a separated bike trail so it was a great commute, but I rarely rode to work due to the poor bike shower situation since after an hour's ride I definitely needed a shower before work. But I was lucky enough to be able to share a drive in to the city with my wife on most days, then I'd bike home since I usually left work later than her.
40 minutes might be a slow pace for many, but there’s a couple of decent hills, a bunch of stop signs and lights, and my steel frame bike with my panniers filled with the stuff I need for the day is pretty heavy.
An e-bike could change the equation significantly.
And I'm from Holland and used to bike every day when I lived there. I wasn't exactly fit (we don't have that American reverence for sports or fitness in Holland) but not terrible either.
Now I don't own a bike at all but I walk a lot.