Now you don’t have to worry about how long you must train yourself or others!
You gained an entryway to the time-compressed dimension of the Room of Spirit and Time, besides proper accommodations to better take advantage of the Chamber’s environment. Using Dende’s improvements as part of the schematics, common limitations such as limited usage (two times only) aren’t a factor, accompanied by the portable quality: an unassuming key, once you insert it in any door acts as a gateway to the Chamber.
What sets apart this one from the others, is the plethora of possible avenues of training this possesses, taking inspiration from other counterparts across the Dragon Ball franchise and then some: Every 10km the gravity increases by a factor of 10, the temperature fluctuates from frigid to scalding, air pressure is comparably a quarter that of the Earth, you can probably go mad at the endless expanse of the Chamber, bringing physical mirages of past opponents to serve as training partners, those are among the most distinguished features of your Chamber.
Last but not least, the Chamber’s passage of time is compressed, lengthening from one day to one year within the Chamber. Goes without saying, no?
For those who thought they could bypass Acclimation with this, this has the unfortunate quirk of lowering the returns of your training within the Chamber to 30% of progress, amounting to a respectable yet lagging advancement to your power’s growth to those who have this Drawback.