Correct, the AWS free tier gives you 750 instance hours per month. So if you run 10 servers for 24 hours then you will consume 240 instance hours per day. If you run 1 instance 24 hours per day for 1 day then you will run 24 instance hours in one day. So you can spin up those servers for a few hours a day to practice on but you would quickly lose your time before the month is up.
If I answered your question, can you please accept the answer. If not then feel free to keep asking questions, I'm happy to help!
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