By adding the following line to your .Xresources file:

	zwgc*minTimeToLive:		100

you can set a minimum on the amount of time (in milliseconds) that a
zephyr message must be on the screen before it will accept mouse clicks.
This means that when a zephyr message pops up on the screen any mouse
clicks in the zephyr message during that period of time will not cause the
zephyr message to disappear; note that any mouse clicks during that period
of time will be totally ignored and not queued.

Note: If you are unsure about X resources, and how to use them, see the
answer "How to use X RESOURCES" under the "XWINDOWS" topic of our browser.