My question is this:
I want to express the time it takes for multiple servers to complete tasks for multiple users. I divide the time into $t$ time slots, and each task may occupy multiple time slots. Assuming that a user's task is uploaded in $t$ time slot, how can I express the time slot service after $t$ time slot to allocate corresponding resources for it? How can I express the total time it takes for all users to complete their tasks?