How long does the Minecraft time (for example 24000) last in real life minutes?

How long does the Minecraft time (for example 24000) last in real life minutes?

I think 20 Minecraft ticks are 1 sec in real life

So a day in Minecraft lasts exactly 1200 seconds?

A game tick (i.e. The world updates itself here: fire spreads, plants grow, etc.) occurs every 0.05 seconds.

Yes

I think what you mean is RandomTickSpeed (determines how quickly plants grow, leaves disappear, fire spreads, etc.), and not the ticks of the game itself.

A tick occurs every 0.05 seconds and random ticks can occur as a result of each tick. A certain number of positions are selected in each of the (sub) chunks (i.e. Areas dividing the game world). If there's a time-dependent block at this position (loose leaves, seedlings, etc.), this is updated. "gamerule randomTickSpeed [int]" is a command with which you can set how many random ticks should actually occur per tick per subchunk. The difference between the (normal game) ticks and random ticks is that game ticks occur continuously and at the same real time interval, but random ticks only apply to randomly selected blocks. However, the questioner asked about the "Minecraft time" and these are ticks (which the virtual time of day also depends on).