Hi Marcus
Please, find in the link below a copy of your file with the answer and solution to your question
https://1drv.ms/x/s!AjGRD1TlwpAGmUSKk7uy7jhn-YhD?e=CI0m9K
Notes:
1- The Start time in column B must be entered with the date as a full Date-Time stamp, otherwise Excel doesn't know "1:00:00" what date belongs to
2- With the formulas introduced in the range column G to M and the ones used in the Conditional Formatting.
You can prescind from (leave out) the use of all the cells marked within the 3 rectangles
Unless you need to keep then for some other reasons
Do let me know if you need more help
On the other hand,
If the answer helped you.
Please, consider marking this thread as answered.
It would help others in the community with similar questions or problems.
Thank you in advance
Regards
Jeovany