I would be awesome if there was a way to lets say start a chunky at 1 am and schedule it to stop at 7 am.
used for generating chunks at night, which is quite usefull

Thanks for the suggestion! This has been a thought at one point but this is generally a pretty niche ask and I don't really think it belongs directly in Chunky itself as to avoid feature bloat. There are plenty of other plugins that exist (just from a quick google search: Command Timer, ConditionalCommands, etc). You can also get creative yourself and schedule it using a data pack or cron job. Basically anything will work since chunky's commands don't require a player to run them.

Aside from the above, the only reason why I can think of someone wanting something like this is if you're pre-generating your world with players online, which is generally a bad idea anyway as it basically defeats the purpose of doing so in the first place.