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Wireshark will call dumpcap to do the capture. (diagram here).
dumpcap doesn't allow duration and interval concurrently:

C:\>dumpcap -b duration:100 -b interval:30
dumpcap: Ring buffer requested, but capture isn't being saved to a permanent file.
dumpcap: Ring buffer file duration and interval can't be used at the same time.

There are two issues here that are worth opening a bug report on the Wireshark Gitlab issues page:
1. The gui should give a warning and prevent duration and interval both being picked.
2. The "when time is a multiple of" option is not connected in the gui which results in the pop-up error box.

Wireshark will call dumpcap to do the capture. (diagram here).
dumpcap doesn't allow duration and interval concurrently:

C:\>dumpcap -b duration:100 -b interval:30
dumpcap: Ring buffer requested, but capture isn't being saved to a permanent file.
dumpcap: Ring buffer file duration and interval can't be used at the same time.

There are two issues here that are worth opening a bug report on the Wireshark Gitlab issues page:
1. The gui should give a warning and prevent duration and interval both being picked.
2. The "when time is a multiple of" option is not connected in the gui which results in the pop-up error box.

(Update: open issue exists)
16783 Multiple Files preference "Create new file automatically...after" [time] working incorrectly

Wireshark will call dumpcap to do the capture. (diagram here).
dumpcap doesn't allow duration and interval concurrently:

C:\>dumpcap -b duration:100 -b interval:30
dumpcap: Ring buffer requested, but capture isn't being saved to a permanent file.
dumpcap: Ring buffer file duration and interval can't be used at the same time.

There are two issues here that are worth opening a bug report on the Wireshark Gitlab issues page:
1. The gui should give a warning and prevent duration and interval both being picked.
2. The "when time is a multiple of" option is not connected in the gui which results in the pop-up error box. box.