Download the planet.pbf and extract from it. >From a pbf planet file on a quad-core/8Gb RAM machine it takes me roughly 1.5 h to extract all ways marked natural=coastline.
If you need updates more often than the weekly PBF, it takes about 2 hours on the same machine as above to apply the daily diffs with Osmosis and if you do not need a daily update just merge several daily diffs together before updating your planet file it will be way quicker than updating the planet for each day.
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