Maximum values for documents, study sets, open tabs etc

I am thinking on how to organise my huge research project, therefore I am thinking of how it is best to do so and what are the limits.
How many documents can imported in a study set?
How many open tabs are possible in a study set?
Is it better to divide the info across multiple study sets? If so, how to I cross reference info on the same topic? Or is it better to organise the info in Child Mind Maps? But how do I then keep an oversight of more than 100 documents added to the Study set?
I am very curious how you are organising your projects.
Thanks