Taking breaks during tavaf is permissible for valid reasons, and the haci generally may resume from where they stopped without restarting the entire tavaf. The most common scenario is when the iqamah (call to start) for an farz namaz is announced during tavaf. In this case, all scholars agree that the haci should stop tavaf, join the congregational namaz, and then resume tavaf from where they left off. Hz. Peygamber (sallallahu aleyhi ve sellem) said: 'When the namaz is about to begin, there is no namaz except the farz one,' and this takes precedence over the voluntary continuation of tavaf circuits.
Sheikh Ibn Uthaymeen ruled that breaks for genuine needs — such as using the restroom, drinking water, resting due to fatigue, or renewing abdest — are all valid reasons to pause tavaf, and the haci may resume from where they stopped. He noted that the continuity (muwalah) of tavaf, while sunnet, is not a strict condition (shart) for its validity in the stronger opinion. Therefore, a gap in tavaf does not invalidate the completed circuits.
Sheikh Ibn Baz similarly held that if a haci needs to take a break during tavaf for a legitimate reason, they may resume from the point of interruption. However, he sunnet not delaying unnecessarily, as completing tavaf continuously is from the Sunnah. Some scholars, particularly in the Maliki school, held that if the break is excessively long without a valid excuse, the haci should restart the tavaf. The practical advice for hacilar is to resume promptly from where they stopped after addressing their need.