Firstly let me introduce myself - I am a complete noob who has a few favourite maps and most of the time I prefer joining the server when those maps are being played.
Recently I found out about a command (!mapas) which kind of gives you an idea of what are the last 32 maps played. However, I also understand some maps are set to longer cooldown than the others. If you are a more regular player than me you would probably have better estimation about how much time has left for a specific map to be nominated if it is not in the list of !mapas.
That being said, I would have highly appreciated if there was an option that clearly states the exact time left for each map to be available for nomination again.
All the best