In general, the most common length-of-stay options for the India Tourist e-Visa are as follows:
30-day double-entry e-Visa You can stay in India for 30 days from the date of entry, with one or more authorized entries.
1-year multiple-entry e-Visa You can stay in India for 365 days from the date of issue, with one or more authorized entries.
5-year multiple-entry e-Visa You can stay in India for 5 years from the date of issue, with one or more authorized entries.
It is important to note that the duration of validity of the e-Visa India does not mean the total duration of your stay in India. The actual length of stay will depend on the purpose of your trip and any other conditions attached to your visa.