How long a drive (timewise) is it to Mt Bohemia? Assume its not terrible winter weather.
It's around an 8 hour drive. That's the short answer.
The long answer is Mt. Bohemia is actually on eastern time, and that factors into how we usually do it...
Leave in the afternoon sometime, head up through Green Bay and in about 5 hours you will be in Iron Mountain, MI. Plenty of choices here for food and fuel, so stop and take a break. If you want to, you can spend the night here, or continue driving. In about 1 hour you will be in Baraga, where you can spend the night or continue on to Houghton which is about 2 hours away, but go no further than that. In the morning get up and finish the drive. Mt. Bohemia is about 1 hour past Houghton. Also keep in mind that Iron Mountain is on Central time, but Baraga and Houghton are both in the Eastern time zone.
On the way home, we usually ride until around 2pm eastern or until everyone in the group is too exhausted and/or injured to continue. Then we begin the drive home and arrive around 9pm Central, which is a very reasonable time to get home, shower, and be well rested for work the next morning.