Have my Sub serviced?

I bought my Sub Date (126610LN) from an AD in January of 2023. I wear it every day – that’s why it’s dirty in the pic. It was running about +1 seconds a day for a long time. It now runs about + 21 seconds a day. These are rough figures just based on time.gov.
Questions:

• Would Rolex service it under warranty?
• Approximately how long would that take?
• Am I overthinking 20 seconds?

Thanks for your thoughts.