The woods are almost my front garden and have always been great to ride. I was worried when they started proposing trails there, but I think they’ve done a really good job and they’re quite good fun. It’s a small area so you’d struggle to fill an hour, I often do about 3 laps from my house in an evening and pack the bike away all in under 60minutes. So as suggested, I’d park at Rivington and ride over and you can then get a good ride in.
I wouldn’t drive 45 minutes just to ride it though – you need to ride around Rivington to make that sort of drive worth it.