jen, i meant leaving the cork or cap on over the candy for 4 days. my HO, this is a little on the extreme side. i keep russians/hybrids/mutts and have for a number of years now, and have helped others migrate to russian bees. leaving the cork in/cap on for one day is sufficient (unless you see otherwise*), pulling it, and wait another 3 or 4 days is fine to let the bees release her. the bees are either going to accept her or reject her. i would not directly release a russian queen into a non russian hive, and have not released russian queens directly into russian hives either. these queens are too hard to come by.
*i like to lay the queen cage on top the frames prior to placing her in, to observe how the bees respond to her. if they respond well, i often times remove the cap/cork right away.