When you use a sudo command normally the password is saved for 15 minutes, If you want to change sudo remembering time in ubuntu, you need to change the configuration of visudo. This post explain you how to change sudo remembering time in Ubuntu, debian.
To start, open terminal and type the following command:
2- Now look for this line :
Now change it to :
Defaults env_reset , timestamp_timeout = X
X is the time which we remember the sudo password .
Now Press Ctrl+x and save .