The good news is that it's not such a long walk from the gates UA uses to baggage claim. I don't know how long it takes for UA checked bags to arrive. The bad news is that you must go down one more level (escalator or elevator), walk further down a little hill, past a DL group check in counter, and then to the left toward the elevators and escalators to go up a level before walking to the far right end for the hotel shuttles. You're basically going down from baggage claim level to walk under the airport roadway and then back up to the hotel shuttles on baggage claim level but on the other side of the roadway, which is completely impossible to cross as a pedestrian (barricades and fences, so don't try it).

Most folks here are Minnesota nice so you should be able to call and have the shuttle wait for you within reason. Otherwise there are taxis....or Uber. [BTW some MSP airport hotels have shuttles 24/7 or are at least able to be called at any hour outside of their scheduled runs.]