Firstly, nothing is going to change for some considerable time, between 2 and 5 years.
Actually, exactly 2 years from invoking invoking article 50 of the treaty of lisbon. Yes, that timeframe can be extendet if both sides agree on that, however, dont expect the EU to show any inclination to that.
The EU has already reminded the UK today that they cannot sit back and relax until UK-wrecker Dave Cameron has been replaced in October. The EU will fast track this as much as they can now that the die is cast.