Let's say you have a projected retirement date of 10 years. Would you work an additional 8 hours a week to cut that down to 8 years or 7? Let's assume you are working 40 hours a week. IOW 9 to 5 type job.

Well, in my industry, and mathematically, technically a 40 hour a week job is 8-to-5 (you know, unpaid lunch break).

The answer is no.

I have worked 48 hours a week, on average per week, for several years in the past. But I am salaried so I don't get paid extra. At the time, I was being rewarded with raises. Those aren't happening at my current company, so I try to stick to 40 (but I did just hit 41 the last two weeks). Actually, this last pay period was the first full working pay period I had since September.

8 hours a week, 48 weeks a year, that's almost 10 extra work weeks a year. In 8 years, that's 80 weeks of working extra, all to retire 104 weeks early. Doesn't seem like a good trade to me. Especially since I have small children. I'd rather spend time with them now.