How many debit/accounts is maximum?

4 accounts is OK, but minimum balances tend to get in the way of maximizing liquidity.

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If you can, decide on 2 (existing or new) accounts that separate spending and saving. For saving, make it a high interest/minimum effort account.

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For spending, make it an account with no minimum balances. Plenty of accounts fit here. If you can get better interest, it's a bonus.

Generally, I will suggest most people to have two bank accounts - one for salary and the other one for expenses. Here is why: How to Create a Monthly Budget

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In most cases, this is sufficient. If you need more than two bank accounts, accounting may become more confusing or difficult.