The HTD / RILOR rates have sneakily been increased, so the max distance claim is now 75 miles. I travel 55 miles each way, but do so around Lincoln ring road, so it often takes me over 1 1/2 hrs to get back.
It's really hard as by the time I get back, the 'quality time' that you get with your significant other is miniscule, after having dinner I am often crashed out on the sofa by 9pm, and Friday nights are for catching up on sleep, not going out.
However, I went on promotion, and worked out that I would be worse off financially if I moved into the mess, something else you have to take into account.
IMHO, if it's any more than 1hr each way, it's not worth staying at home, you become (more) irritable, and even more prone to a smash on the great British roads.