If a villain were to commit a murder in Norway, which has no statute of limitations for murder, but managed to evade the police and escape to another country - how would extradition work? This assumes that the villain successfully stayed under the radar, until the statute of limitations for murder in the country they escaped to expired, but they are in a country which has an extradition treaty with Norway.
As a random example: Portugal has a statute of limitations of 15 years, after which even the alleged child killer that kidnapped and murdered Madeleine McCann cannot be charged. If they escaped Norway to Portugal but stayed hidden for 15 years would they be extradited back to Norway?