I added this to sudoers, but I am still being prompted for a password.
Defaults:andy timestamp_timeout=600
Am I doing something wrong?
Just curious are you wanting to change the sudo password timeout?
Probably off base but if so did find this for Ubuntu:
https://itsfoss.com/change-sudo-password-timeout-ubuntu/
Also if your command is correct maybe try a two digit value for timeout
Guesses
Edit: Re reading are you being asked for an initial password and want a delay before it asks again?
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You get the gold star. 
I changed it to 90 minutes.
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Is your post Vietnamese?
Translate says Vietnamese detected and translation is
I have the same, who helps.
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Thanks mendy.
Did you copy and paste the statement into a translation engine?
Welcome Michhol to this community.
The members are very knowledgeable and eager to help folks.
They are patient too.
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Yep, searched for translate, copied OP's request / pasted into box and it gave me the English version. Believe there are lots more available, did not scroll down just used first on screen.
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Thanks mendy for your effort.
It will help me in the future.
Andy
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