Unclutter its a program which helps you hide the cursor after a set time of no mouse activity.

This time amount can be configured on your system by editing this file:

/etc/default/unclutter

and changing the line:

EXTRA_OPTS="-idle 1 -root"

to a higher number, like 5 or 6:

EXTRA_OPTS="-idle 6 -root"

This will make Unclutter wait for 6 seconds before hiding the cursor from view.

References & Links

Ubuntu Forum Thread - Hiding mouse after being few seconds idle on X display