If you have a tourist visa, you will need to wait 2 months before reentry.
From
this page:
Question: When do I need a re-entry permit?
Answer: The Permit to Re-enter within two months only applies to current Tourist Visa holders who need a permit which will allow the applicant to re-enter India within 2 months after last leaving India. This permit is granted only if the need is urgent, and not for Business Activities/Employment or pursuing studies/research, etc. If the visa holder is traveling to multiple countries on the same itinerary, no permit is needed as long as trip follows the itinerary exactly. The visa holder must carry a copy of the itinerary to show the Immigration Officer. If you would like to apply for a Permit to Re-enter within two months, please proceed to the Get An India Visa page. Or, you can visit the Permit to Re-enter requirements page for more detail.
Question: I am traveling back and forth from India within the two-month period but during one single trip. Do I need a Permit to Re-enter?
Answer: If the visa holder is traveling to multiple countries on the same itinerary, no permit is needed as long as trip follows the itinerary exactly. The visa holder must carry a copy of the itinerary to show the Immigration Officer. However, we cannot guarantee that you will be granted re-entry by the immigration official.