For the purpose of calculating lease contracts in IFRS 16 it's sometimes needed to have wide time ranges in the model. Currently, the amount of future years is limited up to 50 years and past years up to 20 years (link). This means you have a maximum time range of 70 years. We experience that some lease contracts extend 70 years and therefor require a wider time range to do certain calculations without work arounds. It would be succesfully solved if time ranges are either unlimited or extended up to a maximum of 100 future and past years.