I've just swapped my standard Sky box for Sky+ (not an upgrade, it's my sister's old one) and decided to see if I could work out how many hours recording I'd get from empty. I set a manual recording from 12:00 noon, right through until 05:30 in the morning (17.5 hrs by my reckoning) and it said this would require 114% I thought I'd read somewhere that even the oldest Sky+ boxes would hold about 40hrs ? NOTE: I haven't yet replaced my LNB for a twin cable one - so can only record on the channel I'm watching. I'm sure this isn't relevant to my question, but I thought I should mention it just in case. Thanks in advance.