Calculate the number of days a chw took to complete forms between visits

Hi, everyone

I have a form which has to be filled 7 times (seven visits). I would like to calculate how many days a chw took to fill forms between visits., i.e:

Visit 1 – number of days he/she took – visit 2

Visit 2 - number of days he/she took – visit 3

Visit 3 - number of days he/she took – visit 4 and so on.

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