In most sit-down restaurants, it's generally not considered rude to ask for a refill more than two times, especially if the restaurant offers complimentary refills. However, there are a few factors to consider:
Politeness: It's essential to be polite and courteous when requesting a refill. Using phrases like "please" and "thank you" goes a long way in showing respect to the waitstaff.
Consideration for Others: While it's acceptable to ask for a refill when you genuinely need one, try not to excessively request refills if it inconveniences the staff or other diners. Being mindful of the restaurant's busy periods and the waitstaff's workload can help create a more positive dining experience for everyone.
Beverage Policy: Some restaurants might have specific policies regarding refills, such as a maximum number of refills per customer or charges for additional refills. If you're uncertain, you can ask the server about the restaurant's refill policy.
Tip Appropriately: If you require frequent refills due to specific dietary requirements or preferences, it's considerate to tip the waitstaff accordingly, acknowledging the extra attention and service they provided.
In essence, as long as you are polite, considerate, and within the restaurant's refill policy, there should be no issue with asking for a refill more than two times. The key is to be mindful and respectful of others while ensuring your dining needs are met.