New DM question - how far ahead do you plan?

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**Togusa**

some bloke wrote:
I'm putting together a campaign ready for when we're allowed to go out again, and I'm quite a long way into it. I'm writing it in such a way that the players aren't railroaded, and I'm bvasically trying to come up with plots for the various places on the map which interlink in some way, so as the players play more of my quests, they will find more things which link together.

I'm wondering, how far ahead do people normally plan when they are making their own world to explore? do you tend to write entire mission and plots, or just the locations and then make up the next one in time for next session?

At any given time I am three steps ahead of my players. I have enough material to run 16 hours of gaming not including the weeks current session, just in case.