How many external HDDs can you have in a Raspberry Pi 4 8gb?

I am sitting at 21 drives:

However, my hubs or my Pi is starting to act up now. When I passed the 20 drives mark, 2 of my drives did disappear. I had to disconnect and reconnect the disappeared drives. Nonetheless, they show up without any issue.

I also checked my plots’ response time with chia plots check. It took around 4 secs no wonder chiadog didn’t inform me about any response time issue:

I am suspecting Chia’s GUI that it could take a troll on my CPU when farming on many drives as my CPU is running at above 90% all the time now:

I will farm with chia start farmer-no-wallet but I am not sure yet that could allow farm without having to sync the full node. If that works, it would significantly reduce the CPU usage.

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