http://msmvps.com/blogs/laflour/archive/2009/02/17/sharepoint-tip-14-do-you-know-how-fast-profiles-are-imported.aspxHave you ever tried to import User Profiles? It’s a bit slow process. A lot of stuff is created in background. For the large farm, when you need to import a lot of profiles plan enough time for this. Profile database import takes roughly an hour for everyenCommunityServer 2008.5 SP2 (Build: 40407.4157)