Your chance of being dealt a five-card royal flush on the initial deal is a minuscule 0.00015 percent
If you are holding five “garbage” cards and discard all of them for new ones, the chance that it will result in a royal flush is 1 in 383484
Lucky you if you were dealt four cards to the royal flush right off the bat.
You’ll be dealt three cards to a royal flush once in every 92 hands, on average, (or about 13 times every two hours)
You can expect to be dealt a two-card royal flush once in every 13 hands on average (or about 46 times per hour).
You’ll average being dealt only one high card on the deal about 100 times per hour.