It is allowed, however keep in mind that, in this rp, the guilds of other regions, such as the mages guild, the fighters guild and the dark brotherhood, are not connected to the guilds of the Illiac bay, meaning that if you were a member of the dark brotherhood in Cyrodiil you will not be a member once you arrive at High Rock or Hammerfell and you will have to start from the beginning. Even more, because you have abandoned the area of your guild you are not a member anymore because you are considered to be disappeared

There is no deadline, take your time, but obviously, since we are all eager to start the sooner the better