How to calculate average number of days between series of dates?

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I have a dataset with a series of dates listed for each variable. I want to calculate the average number of days for each variable. Ideally, I would get a numeric value that would have the average.

For example, VarA would be 1 because there is an average of one day between each value. Each variable has the dates in order (ex. VarA has the most recent date last).

How would I do this in R?

Example of my dataset:

Variable Date1 Date2 Date3 Date 4
VarA 09/01/21 09/02/21 09/03/21 09/04/21
VarB 08/01/21 08/17/21 09/02/21
VarC 09/25/21


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