Hi @Anonymous User
I don't think the Sky Q Boxes where you pay a premium price offers a month EPG.
Where i would be quite content with a 7 day EPG on the NowTV devices (would be much better than the current Now & Next offering).
I tend to use the Sky TV Guide Planner App on my Tablet & Phone for searching what's on the live Sky channels where the EPG on the Sky App is only 7 days.
Just be aware that there is no red button service on NowTV and Sky sometimes changes the live scheduled event on their EPG (especially if you are looking a few weeks ahead).