There is no answer to this question that will hold true for every car or every user.
Every single car will have a slightly variable amount of blow-by gases get past the piston rings. This means each car will have a slightly different amount of PCV gases and vapors being vented into the tank. This will also vary quite a lot based on boost levels, driving styles, atmospheric conditions, temperature and especially the capacity of the given tank you are using.
During colder months, more condesation will build up within the motor than during warmer months. This will result in more fluid being collected during winter than during summer, but it will still be variable based on the above factors.
Each person will need to establish their own baseline for how frequently they will need to empty the tank on their particular car. This is why the vast majority of the kits on the market come with some method by which to periodically check the fluid level, be it a sight glass or a dip stick.