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Windows syntax:

C:\>tshark -r .\smtp.pcap -o tcp.calculate_timestamps:TRUE -Y tcp.dstport==443 -z io,stat,0,SUM(tcp.time_delta)tcp.time_delta

============================================
| IO Statistics                            |
|                                          |
| Duration: 9.198 secs                     |
| Interval: 9.198 secs                     |
|                                          |
| Col 1: SUM(tcp.time_delta)tcp.time_delta |
|------------------------------------------|
|                |1         |              |
| Interval       |    SUM   |              |
|---------------------------|              |
| 0.000 <> 9.198 | 7.577713 |              |
============================================

Linux:

[email protected]:~# tshark -r ./nfl_short.pcapng  -Y tcp.dstport==443 -o tcp.calculate_timestamps:TRUE -z io,stat,0,SUM\(tcp.time_delta\)tcp.time_delta
Running as user "root" and group "root". This could be dangerous.

============================================
| IO Statistics                            |
|                                          |
| Duration: 3.144 secs                     |
| Interval: 3.144 secs                     |
|                                          |
| Col 1: SUM(tcp.time_delta)tcp.time_delta |
|------------------------------------------|
|                |1         |              |
| Interval       |    SUM   |              |
|---------------------------|              |
| 0.000 <> 3.144 | 3.168073 |              |
============================================
[email protected]:~#