If you’re travelling to India from the UK on a tourist visa, here are the key points:

• The tourist visa is typically valid for 3 to 6 months.
• You can choose between single-entry, double-entry, or multiple-entry options.
• However, please note that tourist visas are non-extendable and non-convertible.
• It is advisable to apply for a 6 months or 2 years multiple-entry tourist visa.

Ireland:

For Indian citizens visiting Ireland, the visa type for tourism purposes is a short-term C visa.

• The validity of this visa is 90 days.
• You can use it for tourism, visiting family and friends, or short business trips.
• Both single entry and multiple entry options are available

Hope, It helps you.

Original Source: https://www.quora.com/How-long-is-an-India-tourist-visa-valid-for-in-the-UK-How-long-is-an-India-tourist-visa-valid-for-in-Ireland/answer/My-Legal-Services-1