On the box, Eclipse says a game takes 30 minutes per player. We've only played it three times - two-player each time - and our games have taken between two and three hours, rather than the one hour predicted.
I don't think we're particularly slow players (we both get frustrated by slow players in other games), so I was wondering how long other people found the game takes. Does it take proportionally less time with more players? Does it get quicker with practice? (If anything it's getting slower for us as we understand the game better and realise more the consequences of our choices!)