Well zyxel uses an object called scheduling which you use to setup one time or recurring timeframes. Unfortunately each schedule (start and stop) is one instance or one object and they do not allow one to group schedule objects (how silly is that).
So you will need to create a firewall rule for every recurring schedule instance you wish to create. At least you can state which days of the week the time frame is valid within.
The easiest way to accomplish this IMHO, is to Create a Lan to Wan firewall that blocks all USERS using the object schedule that applies.
(lets say two for during the day M-F) and one that covers Sat and Sun - so three rules. Now create a firewall rule on the list before those three that explicitly allows lan to wan access for your own use. Could be your pc, laptop, smartphone etc........
Lan to WAN rules.
(1) allow rule any any for your IP (need to create object for your IP)
(2) block rule any any any (use the schedule object1) DENY
(3) block rule any any any (use the schedule object2) DENY
(4) block rule any any any (use the schedule object3) DENY
So for those times of day your blocking all traffic
objects 1 and 2 during the week, and 3 for the weekend as you have setup. But the firewall rule list first checks the rule allowing your IP to access traffic so its permitted.
Hope this helps.
Now there is one caveat. These schedules do not apply to ongoing sessions. In other words if they are connected to a site (an ongoing session such as facebook) the schedule time will not affect it. My understanding is it stops only new sessions.--
Ain't nuthin but the blues! "Albert Collins".
Leave your troubles at the door! "Pepe Peregil" De Sevilla. Just Don't Wifi without WPA, "Yul Brenner"