How much worth of stocks do you typically buy at once?

For sgx, any amount above 8k is the magic number due to the commission charged by brokerage

I buy as much as I can, monthly.

Seriously, not trolling. I buy as much as I can, so what I am trying to say is that, you should invest as you can comfortably can, don't compare with others.

I can invest for 100 years and I probably cannot match what Warren Buffett buys in 1 day. :)

Buy the max you can monthly (or quarterly) and future you will thank you.

Think of it in term of percentage.
If you have a reasonable expectation on how big your portfolio will be in 1 or 2 years time, then you can work backwards to see how many stocks you want in a portfolio. If you want about 20 stocks, it means you will buy about 5% per stock.

It Depends on your portfolio size.

if I allocated $10k to a stock. Maybe the first position I'd take is 4K? This is for the purpose of entering in more tranches should the valuations get cheaper.

Hope This helps!