The document discusses common timeframes for nationally determined contributions (NDCs) under the Paris Agreement. It notes that the appropriate timeframe is a complex issue, with two main options being 5 or 10 years. A paper analyzing the pros and cons of each option would be useful. It also recommends having clear working definitions for periods of implementation, applicable years, and time between communication and implementation of NDCs. A five-year communication frequency could lead to increasing lag times if paired with 10-year implementation periods. Political cycles and the timing of the global stocktake are also important factors to consider.