Things to consider:
1) Marriage. If you plan on getting married. And if you plan on having kids. If no, move to step 2.
2) Parents. If they have done retirement planning, or if they will be dependent on you. If they are not dependent on you, move to step 3.
3) House. If you have your own place or not. If you do...
... you need about 1.5 - 2 cr to live in a comfortable life in a metro like Delhi-NCR. This is assuming you choose the easiest (and safest) option of putting the money in FDs instead of actively investing. In case you plan on putting the money in slightly more risky places, or if you live in a smaller city, the corpus you need will be lesser.