If I am understanding kyfreemason's suggestion correctly, I would have to agree with Humble Mason. I think that one year is plenty long enough. Should some sort of issue arise like a Brother has to leave town for work for long periods, getting a dispensation or allowing him to pick back up his work is easy enough.
As for members that are part of the military, as things are, it is pretty easy to assist with their situation as well. Those Brothers that are in the military and are deploying before they are able to get all their work done can get a dispensation that allows them to go through the second and third degrees without having to turn in their work for the first two degrees. They will, of course, have to turn in their MM work when they return from deployment, and usually within 90 days of getting back. Though, Army usually sends their guys on leave for a few weeks when they get home which the lodge wouldn't count as part of their 90 days.
I can see one or two ways that kyfreemason's post can be interpretted, so my response is more based off Humble Mason's reply.