[AaronBrown]

I assume you're talking about hold'em or other seven-card game and a single player.

You expect to get 14 straight flushes in 45,000 hands, the chance of seeing only 10 or less about 18%.

One out of every 9.6 straight flushes is a royal flush. Given you have 10 straight flushes, getting four royal flushes will happen 1.5% of the time.

This assumes you see every hand to showdown. That's inflates the numbers because your first two or three cards will often be unpromising.