If you join EZY now and fullfill all requirements for upgrade already - looking apart from the company development requirements - , I guess you can in theory be in the left seat in 2 years time +/-
2 years because there are a lot of SFO's/FO's already in the queue and once in it, there is a slot to be followed so you would get behind them if they have the hours. At the moment there are around 200 who will be ready when their time comes, however there will also be a number who fail the process along the way.
What is the time in BA/Virgin/Emirates/Thomas Cook/Thomsonfly/ect ect?