I installed XF 2.1 as I'm new to XF and imported my big board from https://forums.flightinfo.com which was vB 4.2.x. Took about 24 hours for the import. I then installed the purchased enhanced search and did the rebuild. It took about 48 hours or more to complete the rebuild. Not sure if you can background the rebuild so we can launch and leave or do something to improve the rebuild time required.