I'm not sure that we actually looked at the number of days it took them to provide the challenge function. Really, their role is to provide some advice and input into the design factors, and then to provide ongoing advice and challenge as data is collected to see the take-up of the program that happens. We really didn't measure how often they did that challenge and whether they did it over a certain number of days; it's certainly an ongoing thing.
On April 15th, 2021. See this statement in context.