Bit of a Bump...
ISS Daily Summary Report – 11/22/2017
TangoLab-1 Transfer to Cygnus (OA-8): The crew removed TangoLab-1 from EXPRESS Rack 4, and transferred the facility to Cygnus for a short demonstration of TangoLab-1 operations in Cygnus. This is being performed as a proof of the “extended lab” concept, wherein visiting vehicles can be used as an extension of the ISS laboratory volume while attached. TangoLab-1 is a reconfigurable general research facility designed for microgravity research and development and pilot manufacturing aboard the International Space Station (ISS).
Is NASA planing for Cygnus to stay berthed to the station for longer periods in the future?
I don't think so, just bringing up experiments in Cygnus, doing them there (Or bringing experiments
from the station
into Cygnus), probably only for very short experiments.
I guess it could stay berthed to the station longer, 2 months sounds safe, but I think that since most of Cygnus is used for bringing up consumables, long-term experiments for the station itself and possibly large items (like space suits or backup hardware), there wouldn't be much room left for in-Cygnus experiments.
I wouldn't even be surprised if they did made part of Dragon or the HTVs into mini labs, maybe even Dream Chaser in the future!
We will see, though!