For multi-class text classification, what's the maximum number of labels allowed?

Hello, I couldn’t see information anywhere on the constraints/limitations of the system:

  1. What’s the maximum number of labels allowed?
  2. What’s the maximum number of training texts?
  3. For the upcoming multi-label text classification, will we be able to specify scores, e.g. business 0.8, economics 0.4
  4. What’s the latest rough ETA for multi-label, is it weeks, months, years? Interested in trying it out for some production models