From Jim Pettit's outstanding SIA chart, it seems as though it's never taken more than 26 days to blow through the 11M ice, and in many years 13 days sufficed. We are starting far earlier than in the past so the sun will be at a lower angel and we'll have less insolation than in the past. It is however approximately the same regions of ice that will be melting.
DMI shows that north of 80 has still never cooled off to 'normal' levels. 110 days of April like weather since Jan 1. If this softer, warmer, more mobile ice melts as rapidly as it has in past years we could be in for a record setting September.
Terry