One way of achieving this is through a Gantt chart. This will give you the following results
The Axis is plotted using the Registration Date, with a calculation of DATEDIFF('day',[Registration],[First Paid Date]) which displays the length of time between the two. You can apply a quick filter of MY(First Paid Date) that would provide you with the filer.
Is this what you had in mind?
It's perfect, thank you so much