And like Mike Harrison noted above, this takes a lot of time. You must have the ability to be online nearly 24x7 and not have any personal requirements that will take you out of net access.
Personally, my wife and I are expecting our second child so I know this year will be tough for me to fulfill the job duties of DL, so I'm stepping aside.
Candidates: please remember the time required to be in this 501st job function. If you have commitments (personal, job, service) that will limit your FISD time (during the day, week, year) seriously reconsider running for DL.