1. The Beatles - 'White Album' (1968)
2. Bob Dylan - 'Blonde on Blonde' (1966)
3. The Jimi Hendrix Experience - 'Electric Ladyland' (1968)
4. Captain Beefheart - 'Trout Mask Replica' (1969).....don't like it nearly as much as his first two LPs though.
5. The Rolling Stones - 'Exile On Main Street' (1972).....the last Stones' LP in my collection and, with along with 'Tommy', the one of all the famous doubles which most needs pruning.
That said, I wouldn't touch Side 2:
'Sweet Virginia'/'Torn and Frayed'/'Sweet Black Angel'/'Loving Cup'.....that's brilliant.
Mind you, have you noticed that even the doubles of the 60s were relatively short?
Normally about 72-75 minutes, and 'Exile' is actually only 67 minutes long, that's only 20 minutes longer than 'Automatic For The People' by R.E.M.