Yeah, the way most of these flights go, they end up on the ground longer for getting permissions to fly through airspace, fixing the plane, trying to get more money, and for other random stuff than they actually spend flying.
While you don't need fuel, there's no way you can guarantee that a plane that slow, fragile, and with limited cargo space can remain aloft for long periods of time with human passengers. There is a lot of groundwork, so to speak, to keeping a flight going.
What would be really impressive is if they have been able to actually fly the plane with only short, necessary stops to load food/water and perhaps do some maintenance checking. There would probably be an occasional need to wait for weather on take off. That still wouldn't be 22 days, but I'm sure it could be done in less than 80.
I just wish there was somewhere to go with planes like this. Unless they seriously reduce battery weight, you're never going to do more than some well financed adventuring in a solar plane.