this delay happens every bittrex ico/cfc, i am surprised you/more people arent aware of this fact, but yea it is something that they (again.. bittrex) should work on for sure.

as far as what is so difficult about doing it, i suggest you ask bittrex, because maybe they will have an answer for you, and maybe if enough people complain about these delays they will do something about them in the future

edit: i have 6.7btc tied up in r3d and am not in the least bit concerned that i won't be getting them back via the buy wall..