What I want to know is indeed how much apps are typically open, not at maximum when you need it. It's also important to know the max but for the sake of marketing and usability testing, it's more important to know right what you typically in your own view do and need. And no worries, this is not a question on whether you need the feature in the future but how you use it now and with which apps. We have lots of consumer research and usability research, but very often the depth is missing in this research such as which and how many community apps you are using. The posts here give a lot of insight.