They ship Chinese elms from China to Europe all the time - they are in the dark for 30-35 days...they just lose leaves and regrow them again. That's yet another reason they are used as bonsai.
Where are you going?
Chinese elms don't even need dormancy - they just keep going as long as there's enough light. Mine grow new leaves regular as clockwork in spring, regardless of whether they still have leaves or were completely bald.