There are many ways to do this depending on the logic of the rest of the rule Rule Set. But if you want to only allow browsing between 10:00-10:20 and 12:30-13:30, then something like this might work for you.
Applies to Requests: True / Responses: False / Embedded Objects: False
Enabled Rule Action Events Comments Enabled 10:00-10:20
1: DateTime.Time.Hour equals 10
2: AND DateTime.Time.Minute less than or equals 20
Stop Rule Set Enabled 12:30-13:30
1: (DateTime.Time.Hour equals 12
2: AND DateTime.Time.Minute greater than or equals 30)
3: OR (DateTime.Time.Hour equals 13
4: AND DateTime.Time.Minute less than or equals 30)
Stop Rule Set Enabled Block All Other Times
I attached this rule set. If you type it yourself, be mindful of the parentheses and AND/ORs.
We tried this rule and it worked well.
Thanks so much for your answer.