No allowance for half miles,
It's just a note for your longest distance for that week Trogs, so if you plan on 13.1, just click on 13.
In my dreams - or maybe next year! Think my 'race' target for Marchvelous is going to be a homemade 3.1ish though I hope to be up to at least 6 miles distance wise by then 
Lol, I was only giving an example 
The distance isn't an issue, as long as it's over a mile evryone is happy.
Take it nice n easy, don't want any injuries do we.
I've also signed for a 5k or 10k everydayinMay. Anyone else interested ?