How many days or weeks does it take to adjustment to a new sleep schedule?

I started waking up at 8 am and going to bed by midnight. Before that I was going to bed at 3 am and waking up at 11 am.

Since waking up earlier, I've been getting really tired at 7 pm.

How long will it take for me to adjust and not get so tired early in the evening?

How many days or weeks does it take to adjustment to a new sleep schedule?
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