Is 9 hours sleep Saturday & Sunday too much?

I'm 36.
I wake up at 6am Mon-Fri. Walk home each night from the train station to my house which is about 30 mins.
I have a computer desk job but by Thursday, I'm really tired.
I don't have kids.
I sleep in in the weekends. Sometimes between 8-9 hours, but have more energy for the rest of the day.
Is this too much sleep?
Is 9 hours sleep Saturday & Sunday too much?
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