How many miles does it take you guys to fully warm up? I noticed it takes me forever, like 9 miles. The first 9 miles is usually brutal for some reason. I'm tired, legs sore and aching. But after I hit about the 9th mile mark, I have all this energy and I can crank up the miles and speed. I noticed this even more when I went clipless. I love riding but I almost hate the first miles until I warm up. So how long does it take you guys?