I have been grappling with a similar problem and have been developing a system to track time without individuals continuously having to login in somewhere and u

I have been grappling with a similar problem and have been developing a system to track time without individuals continuously having to login in somewhere and update a database. Essentially my idea involves an auto generated email every Friday which asks the user how they will be spending their time the following week. They are given several options in the form of unique URL's. These URL's update the DB automatically without the user having to login anywhere.