If I’m not wrong (by default):

  • if you have a permanent connection to Internet: avast check for updates each 4 hours.

  • if you have a dial-up: avast checks for an Internet connection each 40 seconds, if a connection is detected (you’re on-line) then, it will wait more 4 hours to check for an update again.

Unless you change your avast4.ini file manually :stuck_out_tongue: