This might be a stupid question but...

Let's say Bob has a million dollars. Bob buys 1M worth of X coin at $0.01. Within a few hours/days, the price increases to $0.02, and Bob now has an extra million dollars in profit. My question, is it actually possible for Bob to sell at this price? The extra million has to come from somewhere, but since the price has already 2xed, fewer people would buy the coin, and so Bob would have no one to sell to. Presuming he's set a limit order, would the order just sit there for hours/days until its filled? Would the money be taken from the existing liquidity pool (and how big would this pool have to be so that 2M wouldn't cause a significant drop in price??) How would any of this work?

Once again, im sorry if this seems like a stupid question. It's just that I've read about people trading with huge amounts of money and I'm like, how??