I readit as
During business hours this carpark is only available to disabled badge holders only.
Outwith those times you can park for up to three hours and can’t return for 2.
The rational for that would be to ensure it doesn’t just fill up at 6pm and stay full for the rest of the evening. Ie keep some parking capacity available at all times so people don’t start parkin elsewhere out of desperation.
I actually think its pretty clear*. But can kinda see why a double look is required.
*I could ofcourse be totally wrong. But its the only way the sign makes sense.