I can achieve 1 kph, just with my commute. Any other cycling (FNRttC, shopping, etc) just adds to that.
1mph would be a bit harder, I'd have to do just under another 9 miles every day (on average) to get up to it. One 63 mile cycle a week would do that, but I don't achieve that at the moment. One 63 mile every month or so (a FNRttC) and some shorter distances in between, but probably not the required amount.
It's an interesting idea, maybe I'll try for this starting in January.