That was a decade ago, or more, and so I wish a remembered more precisely. I had about 8 feet of track. It stopped about 2 feet from the easel. Getting the track flat, fixed and perpendicular to the easel took some time, even with a Versalab, but that was mainly because my very old concrete floor was uneven.
If you get the manual, it'll tell you lens and track length needed for a given enlargement.
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