This one was hard to explain in the Title field.... I have a list of dates/times where faxes were sent and received. I'm trying to find a concurrency, or the max number of fax lines I need for our current volume. I've broken down the time from seconds to mm:ss. Obviously if a fax lasts 10 minutes, there are other faxes being sent/received in that time period. According to my data, I'm trying to find the highest concurrency. Below you can see an example. The first fax lasts 27 minutes, while other fax are coming in or being sent. Just by looking here, I see that I need at least 7 concurrent lines. But I have thousands of rows, so I'm trying to find a formula. Make sense?

i.e.

Start Time Connection_mm:ss

8:02:22 PM 27:24
8:11:40 PM 00:37
8:14:50 PM 00:22
8:17:06 PM 00:25
8:17:06 PM 00:25
8:17:02 PM 00:00
8:12:28 PM 07:41
8:43:42 PM 01:30