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Start with it too long. As you can’t glue steerer tube back on if you cut it off.
Do a couple of shake down rides and adjust the bar height. Once you find a comfy position consider cutting the steerer but still leave a little excess.
Once new bike thrill wears off you might find you are not so keen on staying so low. But if you are then consider a further trim.
I'm having a new bike built up and need to decide how short to have the steerer cut. I've spent a lot of time playing with the geo online and due to a long head tube I plan to slam the stem. So, how much should I leave above the stem for now to be safe?