Trump has much to deliver in a short period of time. The problems of the country become his in January.
- convince companies to lower prices on consumer goods/services
- reduce gas prices (granted they don't have far to go now)
- close the border that's been "open" since the 80s
- Negotiate peace with Russia/Ukraine and Israel/middle east
Every day past day one where the cost of Cheetos stays high, gas prices are more than $2/gallon, wars/conflict exist, and illegal immigrants are coming through will not be a good look.
Plus we all know he has his revenge tour planned so that will take up some of his focus. At 78 I'm sure he has the energy for all of this.