The ice in Greenland is up to 3000 meters thick, and Antarctica is up to almost 5000 meters. Are you suggesting the net melt could average up to half a meter a year?
"Thousands of years" is clearly wrong, so it is at best several centuries.
About "decades": I'm not saying it will, but that it could.
It is completely in the plausible, and scientists have been proven to be too much conservative, to the great surprise of everyone including themselves.
That says that the fastest plausible scenario has the ice sheet melting in 1000 years, while the greater likelihood is 10,000 years. And that's if/after we cross temperature thresholds we're not guaranteed to cross.
Nowhere does it entertain the whole thing going in decades. If you have credible sources that argue for the possibility of decades, or even a century or two, you should add that to the page.
