It is 120 miles from Bergland to Ishpeming via Sidnaw and trail 8. So add another 14 miles to get to Marquette but I would spend the night in Ishpeming as it is much easier by sled. The trail from Bergland to Sidnaw is mostly an old rail bed for 45 miles. The trail from Sidnaw north is an old logging road that twists through the forest and is one of my favourite trails.
We ride every year from Mercer, WI to Munising, which is 305 miles and it takes about 11 hours including stops for breakfast and lunch.
So you could ride from Bergland to Ishpeming and back in one day if you wanted.