Garlic dude,

Set the vice over some ammount, (pick your number)

When ya swap it , swap the covers :-)

Dave

Dave, I take it your refering to Bridgeport type mills. In my opinion a
better stratagey is to move the vise off center on the table in the X
axis. Alternate sides every so often to spread the wear over a longer
length so when you need to do some longer work you don't develop a
rotator cuff problem.

Extra points for moving ram in and out occasionaly to spread the wear
over the Y axis.