Max 2 trades between 0:00 and 0:00, max 2 trades between XX:XX and YY:YY... it depends.
But some combination with "Check trades count", "Counter: Count n then pass", "Counter: Reset", "Once a day"... depending on what is needed.
Or if something like "Twice a day" can be used (there is no such a block), I can imagine two "Once a day" blocks connected in a way similar to these conditions: http://fxdreema.com/demo/applying-or-logic-method1 - in this case you will have 2 possible passes, which will automatically reset at 0:00 (because of the new daily bar).