How much should I be saving/investing in a month

Hi, I am 25 years old and I live in Bangalore. I make around 1.35L pm and I’m struggling to understand how much to save or invest in a month. I understand the 50 / 30 / 20 rule but feel like using 50% of my income on needs is a lot.

I also do not understand if I should have a different pot for savings (liquid) and investments or if I should be putting aside all my extra money on investments. Also how much is a decent amount to spend on rent + food + lifestyle etc.

I like living open heartedly but also feel immensely guilty after splurging too much.

How much do you think I should be saving in a month, realistically?