setting up timer externally

Hello ,

I got problem in a task which is - There are two motor initially i will give some 10 sec delay between both the motor and this delay should be displayed on lcd. Then after some time i need to set timer for 30 sec between these motor which will also be displayed on lcd. This is like HMI ( human machine interface ) externally i want to change the timer according to my need.
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Question is not clear.
Explain what you had done till now, and where you are stuck,
which AVR you are using etc.