This article is from the Impotence FAQ, by Sine Nomine llama@drizzle.com with numerous contributions by others.
If an erection lasts more than four hours, contact your doctor or the
emergency room (My partner's urologist said, "If it's hard as a table
after four hours, call."). Priapism can be incredibly painful (see the
seven-hour erection story) and can lead to permanent loss of penile
function.
 
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