The 5 Tibetans - The Fountain of Youth
The 5 Tibetans also known as the Fountain of Youth, is an ancient practice.
Ideally it is done daily.
Building up over time, the aim is to be comfortably able to do 21 repetitions of each exercise. I find that doing 21 repetitions of each exercise takes me 15-20 mins in total.
If you are new or the practice feels too strong, then you should start with anywhere from 2-3 repetitions of an exercise and build it up gradually over time with consistent practice.