I have a table that has a few fields and three of them are - employee, task start date and task end date. I basically have to get how long it takes for an employee to finish a particular task, and then sum up the time spent to accomplish all their tasks for a particular period. Ideally, the format should be in HH:MM:SS. Do note that the hours may exceed 24 hours, so I may not be able to use the time format. Best and simplest way to do this, please.