I caught the bug at the end of last season with a couple of 100km rides. Got another 100 booked at the end of Feb, my first 150 the week after and my first 200 the weekend after that.
Big target for this year (providing I survive the 200 km rides) is a crack at the UK 400 in June. Hope to see a few more Thorns as I push my RST further than it (and I) has ever been before.