MX135 is a mix of pheromones.
There’s a thread about it:
How many sprays depends upon the pheromone. If it has -none within it be careful of buildup (overdoing can result in buildup…).
I suggest you read the newbie bootcamp thread:
You could reapply openness, shine, honesty and IFM after a few hours without problems as they don’t contain -none.