I tend to cycle the same 45 mile route which I extend to 60 ish if I fancy, beautiful ride down the north coast, then turn inland up into the hilly bit around 4 lanes where you can see both coasts, I go at around 15mph and it's around 1000ft of climbing per 10 miles. I also only cycle by myself, I hate cycling with other people unless i'm doing a sportive and I can draft them round.