If you're referring to the virtual races here on SparkPeople, it's the week that you signed up for and you can do it anytime during that week. You would then just record your time for your run on that virtual race page.
Hope that helps!
Fitness Minutes: (155,898)
47,249 6/28/14 5:31 P
SparkPeople, SparkCoach, SparkPages, SparkPoints, SparkDiet, SparkAmerica, SparkRecipes, DailySpark, and other marks are trademarks of SparkPeople, Inc. All Rights Reserved. No portion of this website can be used without the permission of SparkPeople or its authorized affiliates.
SPARKPEOPLE is a registered trademark of SparkPeople, Inc. in the United States, European Union, Canada, and Australia. All rights reserved.