by grant whipp » Mon Jan 19, 2015 5:43 pm
The ones I use are about 18" (.5m) ... but overall length might be determined by how much room you have between the rearward end of the countertop and the hatch hinge cross-beams (or any cabinetry that might be in the way), minus about 5" (hope that doesn't sound too confusing ...

...). Good Luck, and ...
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