A week is the most effective period for tracking statistics and progress. A month is too long, and a day is impractical. A week is the right interval - especially when you have new team members, because underperformance needs to be caught as early as possible, for everyone's benefit.
It is important to track not only the number of new donors, but also the number of calls made and conversations held, the total amounts, and key performance averages. Statistics should reflect not just outcomes, but also the level of work productivity. So that both the coordinator and the telefundraiser have a full picture of what is driving the results.
A telefundraiser will not clearly remember issues from a few weeks ago, but they will remember what happened last week. This makes it the right moment to discuss challenges and find solutions together.