What program can track the time spent at the computer?

Question

Time Management

We need a program that can tell how long the user was in different programs during the day / week / month.
For example:
Browser - 70% (7 hours)
Total Commander - 20% (2 hours)
Sublime Text - 5% (30 minutes)
Photoshop - 5% (30 minutes)

Answer 1

rescue time

Answer 2

Matrix.