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its ok sometimes the program is not helpful

it is quicker to make a copy and scale it up and export - bearing in mind it is the pixel size of the exported image that counts for print quality not...

you can make an internal bitmap copy at 730dpi - you can then scale this up by approx 760 % [760.416666.....] and export at default 96 dpi without compression - this shoild work and hopefully near...

try setting the compression to 'none' in the export dialog - i think your image is taking a very long timeto compress