Its not how much you add, its how much total is in the hive before winter.
/ Seems at least a month too early to be worried about whether you are tanked up or not.
Inspect the hive and note the quantity of stores on each frame (roughly).
Total up how many full frames of capped stores that makes.
One National/WBC brood frame full of honey is about 3 kg. A total of 40lb/20kg is the right ballpark - for when you shut down (for a full colony).
Lift each side of the hive - so you know what it feels like with the amount of stores that you have seen.
Learn the feel of it.
Then you can 'heft' during winter to monitor stores consumed/remaining, without opening/disturbing the bees.
To do it more accurately, buy a luggage scale (they are pretty cheap!)