[T.F.S.B.I.G.W.S.]

We're still getting used to the Tivo Box (installed about two weeks ago). Apparently, if we change to a channel we can rewind for up to two hours for some programs - and for some a whole day (I think the latter is only accessed using catch-up).
As for the lights on the front right of the box - sometimes two reds; sometimes one... ?
If anyone can shed some light - thanks!