Emporium Marathon Question

https://preview.redd.it/lmblsjzqfqld1.jpg?width=2000&format=pjpg&auto=webp&s=a9163c97627a7f9808466f2dbf02e00d3b921376

Guysss I have 63 emporium tags right now

Should I only spend 25 of them??

But, currently I do not have any extra spheres for my owned sets, so I have to hope I get some while spinning, and then I'll be able to spend those faction coins to complete the marathon

What should I do? Spend all tags? Spend only 25? Don't spend, wait for next it to come back?

This returns monthly, right?