What is the ideal amount to save for a 25 year old with a monthly income of $3,400?

Generally, you should save and invest at about 20% to 30% of your monthly income.

Here is a Guide:

Understanding Your Personal Cash Flow

Meanwhile, if you are currently single and have no liabilities, e.g. mortgage, then you should increase the ratio to about 50%. Additionally, you may also look into the financial instruments that you are parking your money - whether you need so much liquidity in the short term.

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Hey Anon, if you started from 0, saving 2k/mth for 10 months on a post CPF income of 2720 is fantastic. That's a 70+% savings rate. I'm assuming you don't have a mortgage or have to pay for rent at the moment plus have little liabilities so it's a fantastic time to be saving that much.

My only advice is to find more ways to add to your income, side hustles that can earn you a few hundreds each weekend will definitely boost your savings capability.