*Please note that these calculations includes assumptions that will be listed for clarity*Assumptions

Every mute attempt is successful

Points gained per mute and time per mute fit in the given time frame
http://i457.photobucket.com/albums/qq295/bubbachunkrr/lsmuting.jpg
A little clarification
Column 1 would be the average prof points gained per mute completed/attempted

Column 2 indicates the time it takes per mute to complete the process

Column 3 is how many mutes are need to reach lvl 65 prof based on points per mute from column 1

Columns 4-7 are how long (in hours) needed to complete the number of mutes from column 3
What does this tell me?
Even at the best conditions (15 points per mute, no failures, and only 15 seconds per each mute) it will take approximately 596 hours of game play to be able to be able to mute magical lvl 55 items again. In other words if you would play 4 hours a day every day and get peak conditions (not likely) it will still take ~150 days to reach lvl 65. A more accurate assumption would be somewhere around 5-7 points per mute and 30 seconds leaving you with 2128 hours of game play needed or 531 days at 4 hours a day.
*Lastly this does not take into account the time it takes to find the mutes or the fg it will cost the buy the mutes.
Let me know what you think and if you have any questions.
I almost have lvl 2 Prof and from what I have seen so far "DUMB LUCK" seems to have more to do with a success then Proficiency!
I hope njaguar intends on fixing things so the Proficiency actually works more so then what seems to be "DUMB LUCK"