If, or should that be when, all of the ice melts the seas will rise by 70m so. But don't worry even with runaway warming, say if the northern permafrost marshes melt and release all of their methane in a lump, it'll take longer than anyone who is alive now in their possible lifetime for it all to melt and I suspect other changes will be the main problem before then.
The benchmark carved on the front of our house is 119m. We're surrounded by hills at about 270m. Or, to be more pedantically accurate, we live on the side of a valley in an incised plain.
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