Estimated Seat Time or Duration of Course

I also agree that this would be a great idea!

I've recently design 5 modules to support a new piece of software we're using. 

I've made screencasts, added SL blocks for interaction etc.

I copied all text into Word to get a word count, then did an online calc for time to read. I added that t all screencast lengths. then estimated how long each SL block would take to fully interact with. That gave me an est time for each module. Pretty slow - go on Rise - work your magic ;)