The real cost of manual reporting
The hours are the obvious cost and the least important one. What manual reporting actually costs you is latency and trust.
Latency, because a process that takes three days describes a week that has already ended. By the time the numbers are agreed, every decision they were meant to inform has either been made without them or postponed.
Trust, because a human doing the same join by hand forty times will do it slightly differently on some of them. Nobody can point at which, so the whole report inherits the doubt — and meetings start with an argument about the data rather than the result.