Remember that retirement is not always the key to happiness. It’s more important that you remember your ikigai (the reason for waking up in the morning) and remain active for the rest of your life.
In a week, you have a total of 168 hours; divide it into 3 buckets of 56 hours each. 1st bucket is for sleep (8 hours/ day), the next 56 hours is for your work life, and the remaining time is your purpose work which will make you happy.