I would let the user decide an exact number. One could keep the main page simple and have the 25 minutes as default but changeable under the "Settings" section. This way it would be still a simple interface but still customizable...
Customer support service by UserEcho
I would let the user decide an exact number. One could keep the main page simple and have the 25 minutes as default but changeable under the "Settings" section. This way it would be still a simple interface but still customizable...