When the Flow Super is full, you can expect to harvest approximately 3 kg (6.5 lb) per Flow Frame (even more if the bees really build each frame out).
One of the great benefits of Flow Frames is that you can harvest as much or as little honey as you want – you can take just one small jar for a gift or the breakfast table, or harvest an entire (or several) Flow Frame(s). The amount of honey for harvesting depends on many factors, including hive strength, local climate and available forage.
With a good nectar flow, it is possible to harvest from a full super multiple times in one season.
It is not uncommon to have very different results from hives kept at the same location and even within the same hive annually compared to previous years.
When harvesting it's important to remember to leave enough honey stores for your colony to see them through the winter.