I am trying to find a formula to find the number of concurrent calls at one time. My columns contain phone provider, outbound number, inbound number, start date and time (one cell), duration of call, and end date and time (one cell) from A to H in the order they are listed. In this stage of the project, inbound and outbound numbers are not important and aren't necessary to include, nor are the phone providers or the durations. Some of the calls last several days, so that will have to be taken into account. There are almost 20,000 rows in the sheet, so it would be ridiculous to do it manually. I am essentially just looking for how many phone calls are active at one time. If there is a formula that can help me do that, that would be great. I have already tried many =COUNTIFS and =SUMPRODUCT formulas, but they are not giving correct results. This project is due fairly soon, so any answer could be helpful.



Thanks!

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