I forget the source, but I think for those keeping count, as Trump's 100th day in Office draws near, it's been estimated he's actually been in the White House for only seventeen so far.
I honestly don't know how many days he's actually been in the White House, but considering he goes on vacation every single weekend, and has spent a majority of his time campaigning and rallying (for 2020) across the country, seventeen days doesn't seem like a surprising amount at all.