مناسك حج - مكارم شيرازى، ناصر - الصفحة ١٣٧ - Mustahab Tawafs
٧- Stopping Mustahab Tawaf is permitted in other than the cases of necessity and could it be continued later from the place that is stopped and it is not necessary to pass the fourth round.
It is better to abstain from performing Mustahab Tawaf when lots of people are performing obligatory Tawaf and crowd is so much congested in order to leave the place of Tawaf for people who are performing obligatory Tawaf.
Mustahab Tawaf has no specific time and can be performed in anytime of the day or night, also it has no specific numbers for performing but each Tawaf should be performed seven rounds.
Mustahab Tawaf does not need Ihram clothing and keeping silence or talking or reciting prayers are permitted during that like obligatory Tawaf, although it is better to recite prayers or pray to Allah.
It is not a good act to recite the prayers with the loud voice in the way that it causes trouble for others.