Yes, it'd be a one-off. I'm doing a late shift at work which is usually no problem, but I didn't realise DP is away tomorrow.
(Well I did know, but somehow it only just dawned on me this evening that there's a clash!)
I've tried our friends who would usually be able to help, but no one's free tomorrow who I could ask, and we have no family nearby.
They do argue. That's what's giving me pause, and is why we've only just started leaving them alone for short times recently.
But they seem to maturing out of arguing so much (I hope!).
Both of them would probably sit in front of their computers without moving an inch for 3 hours!
But, on the other hand, it would take me a while to get back if anything went wrong.
We do have neighbours on both sides they could go to in an emergency.