Eddy
4
If there are no problems, I would just leave things as they are.
Micro updates are done through VPS updates so you should receive them automatically.
If there is a real emergency update (e.g. for a security hole that need to be fixed right away), avast will use a push update and you will receive it almost instantly when the machine (and you ;D ) wake up.
If you want, you can always initiate a manual update to see if there is something new, but that is normally not needed.