[ricecrispi]

I just did the mod this weekend. Based on the systemcooling article, I would say 30 mins to 1 hr depending on the tools you have. If you have the correct drill bits it should be very easy.
Steps
1) Remove screws at the base.
2) remove top
3) use small drill bit to drill pilot hole
3) use larger drill bit to drill OD that matchs barb
4) use larger drill bit to remove the plastics flange on the top
5) cut the barb
6) check to the barb fits snugly on the top and sandpaper the plastic area for epoxy
7) apply epoxy

If you do a two barb mod like in coolercases it takes about 1 hr 1 1/2hrs takes more work to clear the plastic, thread the top and prepare the second barb.

Took me about 2 1/2 hrs because I did extra steps like porting the outlet to a larger ID, removing all the plastic on the top till it's flush, removing excess epoxy, cutting metal barbs, and using perm marker to mark epoxy black.

Most of the time as actually deciding what barb to use but i decided to use old nickel plated 1/2" ID barbs. I had to decided from 9/16" hi-flow fittings, G 1/4"barb, plastic black barb Y, clear plactic barb Y, 1/2" to /3/8" reducer, 1/4" NPT black or clear barb, or old 1/2" ID metal barb.