I can understand why they've switched to a time based limit.. it always did feel a little unfair that the ballot closed roughly 12 hours after it opened and folk were waking up at 5am to get their entry in. However I'd have gone with 24 hours... I think that would be fair. Will be fascinating to see how many entries they have after a week.
The problem sometimes is people see training plans, see week 1 has runs of a certain distance and think that means complete beginners who have never run before can expect to complete those distances. It sadly ain't that simple. A fit person may have a chance, but an unfit person who doesn't run is likely to struggle to complete even week 1. And if they do somehow make it, they'll probably pick up an injury in week 2 or 3. I found this out the hard way.
Sorry my fault, what I meant was the longest run is 5 minutes in the session. You do 3 minutes, 5 minutes, 3 minutes, 5 minutes.. with walking breaks in between. I do have the option of cross training too, that's a good point.