Belgian Nicolas Colsaerts was one of four players on nine under par, alongside England's Steve Webster, Frenchman Raphael Jacquelin and South Africa's Justin Walters.
Korhonen held a five-shot overnight advantage and always looked in control as he posted five birdies in his three-under-par final round.
The experimental tournament saw players being timed on every shot, allowed either 40 or 50 seconds, in an attempt to speed up play.
After three players were given one-shot penalties on Saturday, home favourite Markus Brier and Swede Oscar Stark also fell foul of the new rules on Sunday.
(Reporting by Neil Robinson; editing by Clare Fallon)
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