The toilet bowl was just installed, and there were two drains, and one was blocked with glass glue.

Cut the hole with tiles to the size of the hole, and then seal it with silicone, first put the toilet away, draw a good line, then take it away, put on the silicone, and then put the toilet on it, but don't use it before the glue is dry.

You're better off using a single hole. The double hole is still a bit of a hassle.

The best way is to leave it dry for 24 hours, but if it's already flushed, don't worry too much, and if there is no leakage or smell for the past two days, there will be no problem.

This is to allow the water to swirl and increase the impulse.

It depends on how far apart you are. It is the distance between the toilet drain and the wall, which one is suitable to open which one, it should be noted that the toilet tank should not be close to the wall, and the tool for installing the water inlet pipe should flow out appropriately. The sewage outlet is mostly sealed with plastic and sealant, just pry open the one needed with a screwdriver, and the base should be sealed tightly with glue for installation, otherwise it will affect the suction power when draining.