How many times can you use contactless payment in a day?
There's no limit on how many contactless payments you can make in a day. However, from time to time, your provider may ask you to re enter your PIN manually.
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While contactless allows you to make payments without a PIN, it doesn't mean you can forget it entirely. Card issuers only allow five consecutive contactless transactions that can be made before a PIN is requested in order to prevent fraud.
You can't pay accidentally—your contactless card or payment-enabled mobile/wearable device must be within 2 inches of the terminal for the transaction to take place. And you won't be billed twice, even if you accidentally tap twice.
Because no signature or PIN verification is typically required, contactless purchases are often limited to a maximum amount per transaction, known as a Cardholder Verification Limit (CVM limit). Limits vary between banks.
In general, the magnetic field on your phone speaker is too weak to cause too many problems. So it shouldn't cause any damage to the magnetic strip on your credit card.