Tech is something like noon to 5PM (with BS at the same time as tech). We are not waiting until the last second, just in case they find something we need to fix. If the plane lands at 3, it'll be past 4 before arrival, as it'll take some time to get off the plane, gather things (I know there's no carry-ons to get, but still...), get the car, drive to MSR-H, get lost a time or two on the way (just because that's how the world works), get in the track, find us...
BTW, for anyone driving to MSR-H who hasn't been there before: To get to MSR-H when going south on 288, you turn left on County Road 48. However, there are two county road 48s on the trip. There's one fairly north, and then there's a county line (or two), and then there's another County Road 48. The one you want is just after a very gentle bend in the road. There's a subtle green sign with white lettering (similar to an exit sign) pointing out the track. However, this sign may be referencing the kart track or something, rather than the road course. Depending on your navigation style, you may want to watch mileage or something like that, just to be sure you get the correct CR48.