I think OP means during your work day. You don't want to be working with someone that is working remotely so that, during their work day, they can also look after a young child, or is focused on organizing and going for a long social lunch, or thinking where in this new city they are going to visit.

You want someone who, for the hours that they are working, main priority (unless there is an unlikely emergency) is getting their work done. (and responding on Hacker news)