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Of course this will vary with how much it is used but IME the nortons go a good amount of time without the need to flatten. I don't need to flatten them every time I begin as I do with some other...

The norton is a good flattening stone and will last a long time. If you want a bomb proof flattener a DMT D8C continuous plate is hard to beat.

IME any hone I acquire is flattened before first use. I do it with a pencil grid in the kitchen sink with a bit of water running the swarf off as Josh Earl does in this tutorial here. The nortons are...