Maybe just before the sun goes red giant and consumes earth.
Not enough ice on Greenland to raise sea levels even 1 inch, not that that is insignificant.
Not likely enough water on earth, poles included to raise sea levels 25 foot. That would be near double all the ice and water combined.
Answer,,never gonna happen.
Lets see,,,196.9 million mi² X 25 foot,, sheesh,, 9.604X10^17 cubic feet of water,, more than great lakes by a long shot. Throw in arctic ocean for good measure.