I go to the gym before doing the school run a couple of days a week. I leave the DC at home and they get on with getting ready for school on their own (usually, but there's time to nag them into if they haven't). DH is in but usually asleep, so they can go and wake him up if they need to but they never do.
DH is going to be away next week and I'm really not keen to miss my gym sessions as I'm training for an event and this is crunch time. We live in a flat and know everyone else on the stair. We have friends on the next floor down who have a DC of a similar age and will be in at this time getting ready for school themselves.
WIBU to leave the kids on their own in the flat for around an hour whilst I'm out, explaining that if they need anything they should go downstairs (outside our flat) to the neighbour rather than upstairs (in our flat) to DH?