thanks for the responses, we are are going to minnesota for a family reunion, we want to take about 6 days to get there, spend a few there and scoot straight back on i90,4 days or so on the way back. from Missoula we will head to Bozeman and see the museum there,thats sundays plan, Monday would hit Yellowstone. iv got a list of all the spots at each exit for overnights, that's going to be helpful. the biggest question mark will be the kids. ive driven 12-18 straight for work a bunch of times, but not with my kids. we drove down to Stockton, cali last summer and they did great till the last hour. we will add time for stops, for their sanity and ours lol thanks guys