I'm not running with my phone, which I think is necessary?
Besides, I have an online ekiden (marathon relay) on a Dutch forum, where we have seven teams of six people. The marathon distance is split up in six stages: 5km, 10km, 5km, 10km, 5km, 7.2km. For every stage there are four days in which people can do their stage, tomorrow is the last day of stage three. Teams are put together based on everyone's target time, where the organizer tried to make the teams as much equal as he could - the estimated finish times for the seven teams ranged from 3:31 to 3:42 roughly.
I'm doing the second 10km stage (stage four) in my team, so Monday, Tuesday, Wednesday or Thursday (most likely Monday) with a target time of 56 minutes