Don't have days of too low data reset the number of days on the graph to pass.
It would be nice if when enough trials are not collected on a specific day, the system didn't count this against the client. i.e. If we require 2 days at 80% to pass and they scored 100% day one and get the number of trials, but day two they get 100% but have to leave early or something happens to prevent the number of trials, the system would start them client all over again even though they have been at 100% on all the trials so I would need 2 more days of 80% to move on. I would like the fewer trials just to be thrown out and not counted against the client's progress.