Quick answer: Way too much!
This is something that really gets to me, all the way back to my childhood. Twenty minutes each way, three times a week. Month after month. Year after year. Wow. Plus the wear on the vehicle. That money could have gone toward food and clothes which we were already short of. π
Then for me as an adult it was cut back to about fifteen minutes, but that went on for decades! At even a nickel for every mile, it would still add up, though I'm not doing the math.
As for time wasted, you can't put a dollar figure on that. No wonder so many jws are broke. Sheesh!