Max position size without moving markets

When day trading or swing trading mega cap stocks such as Microsoft, Facebook, Amazon, and Apple, how big does the order have to be to really hit noticeable slippage? I found a rule of thumb that says if your order is under 2.5% of the average dollar volume, you should be safe.

Would the slippage with a $5,000 order compared to a $500,000 order be substantial or is $500,000 for an order normal? Is $100k an eye catching order size?

This is in the context of market orders.

Submitted October 01, 2020 at 09:06PM by hundop423

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