A daily four hour commute is horrifically bad for your health (both mental and physical). You absolutely should not feel bad about quitting or demanding to be allowed to telecommute.

What would I do? Well, that kind of depends on your situation:

1) If you have the six months of emergency funds saved up that you are supposed to, and are either single or married without children, I'd probably quit. Assuming you have actual technical skills I'd move that up to should probably quit.

2) If you have three months or less of emergency funds and/or have children and/or you or someone in your family has a chronic medical condition I would grin and bear it in public, and network furiously to try and find another job so that you aren't "cutting off your nose to spite your face"

3) In both of the prior cases I'm taking it as a given that you are at best ambivalent about your current position or employer. If it's a job you love and it is just the situation that is a problem, then talking with your boss to help explain why it is a problem may be worthwhile. As hard as it may be to believe, some folks out there may look at the setup and not see it as a problem. Either because they're not doing it, or they actually like the ride time to do other things.

Hope this helps...

Why would you feel bad? This is a serious quality of life issue. 4 hours a day commuting is not acceptable for most people. Move, find an arrangement that lets you stay home, or quit. It's not your fault that your boss is making you do this.

Assuming you worked ~40 hours/week before, this extra 20 hours means that your hourly wage is roughly 33% lower. What would you do if asked to take a 33% cut in pay?

Don't feel bad about it. Unless you just moved 2 hours away from your workplace it's not your fault.

Is your boss trying to make you work in another office? In that case can you negotiate with him a relocation package?

One possible compromise is to get a 4g hotspot and work while you are on the bus and only stay in the office for 4 hours.