To answer the title question... I moved to Switzerland for work and was quite happy with
To answer real question... 6 hours a day commute would be too much for me... 3 hours a day can be very tiring over long periods.
My job is 3 hours a day on a good day and 4 on a bad day.
I get to work from home 2-3 days a week though and it breaks it up to make it more pallet-able.
6 hours a day... no... you'll get on fine for the first month or two and then you'll hate it and regret it, irregardless of the extra cash.
Also consider a surprising amount of that extra cash will be put towards fuel and car purchase / maintenance.
3 hours each way in traffic... I'm guessing that's around 125 miles each way... so 250 a day... 1250 a week... or average of 4500-5000/month when you take into account holidays etc.
Sooo... you're going to be wanting to change cars every 1-2 years (3 years max if you get something good an maintain it well)... have you factored that into your costs? Plus £6-8k on fuel alone at 50mpg.