** went 90 through the floor, 90 in the basement, and 45 as it went through the wall. That was with a 20 foot run. Lived in the house, and had no problems with dryer performance. **
A lot depends on make of the dryer. As you can see in the chart at the following link, maximum length can vary greatly between brands.
LINK> How long can my dryer vent be?
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