RTV silicone is just that. Room Temperature Vulcanizing. That means at room temperature it will go off and get solid (relatively solid). If the ambient temperature is higher it will go off quicker. If it’s colder it will go off slower. But it eventually goes off. I can’t remember if it’s an endothermic, exothermic or some other thermic reaction. But it’s something like that.
The upshot is you can bolt the intake on and fire it up. The silicone will go off and set up quicker. It doesn’t need to sit for 24 hours before use.