The minimum amount of time is instant, although this case is very unlikely.
In general you can stick to these estimations:
http://golubev.com/gpuest.htm
So if you buy a rig consisting of 4x AMD 6990 cards you can unlock SL3 in less than one day (considering maximum estimated time is needed what is common with SL3) (per phone of course). The CPU does not matter that much, but cooling and power supply does.
In general you can stick to these estimations:
http://golubev.com/gpuest.htm
So if you buy a rig consisting of 4x AMD 6990 cards you can unlock SL3 in less than one day (considering maximum estimated time is needed what is common with SL3) (per phone of course). The CPU does not matter that much, but cooling and power supply does.