I don't know what the Swedish limits are, but in Finland the "right the charge a person of a crime" (whatever it would be called in English) will expire in:

  - never, if the maximum sentence would be life
  - 20 years, if the max is more than 8 years
  - 10 years, if the max is 2-8 years
  - 5 years, if the max is 1-2 years
  - 2 years, if the max is less than 1 year or a fine
  - if the crime was a "serious sexual crime 
    against a child" it will expire at earliest 
    when the victim turns 28