That one stuck seatpost on a 90s steel frame took me 3 days, not the 20 minutes I quoted
Turned out the aluminum post had basically welded itself to the steel tube over 30 winters of salty road riding, and I only got it out after soaking it in ammonia for two days and twisting it with a pipe wrench, so now I want to know if anyone has a better trick than just telling the customer it's dead.
30 winters of road salt is basically a chemical weld at that point, and 3 days sounds about right for a steel frame. Props for sticking with it instead of just putting the torch to it.