Dr. Patel … raised the topic of fasting for Rama-navami, suggesting that one should fast throughout the night, until the following morning. A devotee volunteered that we fasted until sunset. Prabhupada agreed but added, “If one can continue until the next morning, that’s all right.”

Later, I asked Prabhupada when we should actually break the fast, and he replied that I should inquire when the local temples broke theirs and then follow their standard. It turned out that they broke their fasts at noon, so that day we did too.

Giriraj Swami. “I’ll Build You a Temple,” ch. 2