I have had a draco in the same pot for over 6 years, it's a relatively large pot unsure of exact size.
The roots are extremely pot bound but this doesn't seem to phase it.
I recently took it out of the pot, broke the roots up and cut them back and then refreshed the soil but put it back into the same pot.
They are an extremely hardy plant and will tolerate major neglect.
Don't over water it and it will be just fine.