It all depends on how big the DB is. We just did a 20 user MAS200 4.05 and it was cake. but the DB was all very manageable size (update. The key is to upgrade to 4.50 pvx and then to 4.50 sql. The other area would be custom reports, they take a liitle more time.,,( so far it is anpther 8 hours for the SQL side. but I am guessing 16 total)