While I don't think TRaTB is going to be confused with any Harris masterpieces, I totally dig the long instrumental part. I wish Maiden would do more of that kind of thing. I wish ALL bands would do more of that kind of thing..
I think the fact that it cracks the 10 minute without relying on lengthy breakdowns (SSOASS, Rime, SOTC, etc) is admirable in itself - I just think there are a few issues with the execution in this case.
I think the song would be much stronger if they cut down on the similar sounding guitar melodies that happen either side of Bruce's 'the red and the blaaaack' melody. If they got to the Sabbath-y sounding breakdown that happens around 11:40-50 ish quicker, it would be much stronger. But yknow, opinions and that.
Its definitely not as bad as I thought it was, upon closer inspection. If it appeared on an album as THE epic, it'd probably be fantastic, but up against songs that make far better use of their time (Empire, BoS, IESF) it pales in comparison.