Finsh them while....
..at home as other are suggesting.
But if you are breaking in a new engine on the first flight as a lot of us are doing, remove the gear leg and wheel fairings for the first 10 hours or so. This will assist with engine break in by creating additional drag so that by running your engine hard, which you will need to do, you won't overspeed the airframe, but still ensure successful break in. During your Phase I flight test period you will ideally want to advance airspeeds, maneuvers, altitudes, testing, etc incrementally over a period of time. FWIW, engine break in and test flying a new airplane tends to be a enigma....