This is using Ubilinux based on Debian stretch but the same behavior happens with Ubuntu 16.04 and probably others.
gksudo asks for my password every single time.. I can easily enough configure regular sudo to asks password only every three hours by using visudo. But this does not "take" on gksudo.
Is there any way to make gksudo "remember" the password for some time?
ssh-agent
probably is not running. Is it installed?