If I retire in 2030 at the age of 43 how much should I have as savings? Also what if it's 2035? I stay in Kolkata do not have lavish life.

5 cr

Own House + 5 Crore in Cash (FD+Savings)

30 times you yearly expenses. Plus home.

At least 5cr and a own home

You need to plan for your age, children's education, marriage, lifestyle choices once you retire etc. and based on that plan for what comfortable savings look like. Note: you will be spending post that day and inflation will eat up your savings as money value decreases and your expenses due to inflation will be higher.

2.5 - 3 Cr