I'm flying a King Air B200 PT and we ferry to IND for MX right now. About a one hour flight and 4 hours driving back. Doing it in a week.
We don't have a full time mech, but the airplane only flies about once a week and around 180 hrs/year. A company with a 350 that I'm well versed with does about 400 hrs/year and they probably do one trip to IND a month. Sometimes more than that, but they're very particular about their airplane and they get even the smallest of gripes fixed right away.
Expect to do everything on managing the plane. That is pretty much a full time job in itself. The company I'm flying for hired the FT guy to manage the plane, fly it and be a salesman on the side. He has been with the company a year and has sold $0 of merch. That's only because whenever he's not flying he's doing trip paperwork, running cost analysis stuff for future trips and managing the plane. There's a lot to go into it.
See if you can get the plane on CAMP (I think that's Beech's MX tracker). It will help with a lot of inspections that you might not know anything about (for example, we have the PL21 with the ESIS system and it has to be checked by MX every 6 months or something). The only downside is that Beech puts a lot of stuff that is "recommended" but not mandatory on the reports. Some of that stuff is just BS.
For a one man, one plane operation this is what you can expect:
-FMS Updates
-MX Tracking, proper logging
-Plane cleanliness
-Stocking the plane with food/catering
-Paying FBO bills, CC bills
-Chart updates
-Hourly costs (my company really hawks their costs so the other guy has to run costs pretty much anytime we go somewhere)
-Making sure that you and the plane are ready to go pretty much any time.
-Finding contract guys you can trust that won't try to take your job when you go on vacation or to recurrent.
-If they have their own hangar, hangar upkeep and cleanliness.
There's probably a bunch of other stuff that I'm not thinking of...It's a lot of work, but I would do it in a heart beat. It's actually pretty much my dream job. The King Air 350 is a beast. You can expect full fuel, full pax, full bags about 97% of the time. Easy to fly, easy to land. Can be a bit busy single pilot, but you will get used to it after a while.