A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
I would create a Pivot table from the data, add a DAX formula and calulate End-Start to get the duration, used this as value field, use the Start as row field, dates are grouped automatically, done. Optional: Create a Pivot chart.
If you need further help please upload your file (maybe with anonymous data) on an online file hoster like https://www.dropbox.com and post the download link here.
A macro to anonymize data in selected cells can be downloaded here:
https://www.dropbox.com/s/rkfxuh85j5wyj9y/modAnonymize.bas?dl=1
If you want to upload it to OneDrive, it is important to follow these steps:
Zip your file!
https://support.microsoft.com/en-us/windows/zip-and-unzip-files-8d28fa72-f2f9-712f-67df-f80cf89fd4e5
Login to https://onedrive.live.com (Use the same Login ID and password as for this forum).
Click Upload in the top and choose your Zip file.
After uploading, right click the file and choose share.
Click Get a Link.
Copy the link and paste it here.
Andreas.