Login script batch

Running NT 4.0 / windows 98 clints
I currently run a “NET TIME \\server \SET \YES batch file in the users login script to avoid having incorect times logged in our databases. However, it only corrects the users time if he or she logs out and back in. Currently most users stay logged in for nightly server and workstation backups. Is there an option to have this batch file run every few hours without having the user log in and out.

Thanks,

dave