Table with employee's starting time and ending time recorded for performing tasks.
Times are recorded to the nearest 15 minutes such as 9:15 to 10:30 etc.

An example would be employee scheduled for tasks from
8:00AM to 9:00AM (task 1)
9:30AM to 11:00AM (task 2)
11:00AM to 12:30PM (task 3)
2:00PM to 3:00PM (task 4)
4:15PM to 6:00PM (task5)



What is needed is to determine all thoes employee's who have a lapse of 15 minutes to 1.5 hours between tasks, so the above I would need to identify that the employee lapse of time of lapse time of 30 minutes from 9:00AM to 9:30AM (task2 to task 3) and lapse time of 1hr 15 minutes from 3:00PM to 4:15PM (task4 to task5)

What is happening is that we are scheduling employees during the day and if we schedule less than 1 hour 30 minutes between tasks, we are required to compensate them for that time. If the lapse time is 1 hour 30 minutes or more, we are not required. Like wise if the lapse time is 0 (back to back) such as task 1 ending at 11:00AM and then task 2
starting at 11:00AM M there is no lapse and therefore not required.

Looking for the best solution to identify all employees on a give day that would fall into these lapse of times from 15 minutes to 1 hour 30 minutes.

Thanks in advance for all suggestions.