Calculate Average Time between Two Rows in a Range of Many Non-Consectuive Rows

This may be a simple question, but I've been having trouble getting to the end result. I have a spreadsheet of production data. I've created a macro that will loop through a list of workers and filter based on the date and the worker. I then calculate some summary statistics for each worker. One of the columns, I'm working with is the time that each job was started. So for example:

Confirmation time
8:39:11 AM
8:52:04 AM
8:52:29 AM
9:08:48 AM
9:09:29 AM
9:10:03 AM
9:11:09 AM
9:20:51 AM


I want to calculate the average time between all rows, aka consecutive orders. I was thinking this may be just a simple standard deviation, but the results don't seem right...
The main problem I'm running into is that these rows are not consecutive since the spreadsheet was filtered.

Any guidance or suggestions would be much appreciated.

I feel like there must be a simple answer to this...

This may help if your rows remain filtered,

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