Which isn't a very good margin in cryptography, where we usually aim for things like "longer than the universe's lifetime if every atom was a CPU". But RSA is really slow so we have to compromise encryption speed with cracking speed.
What does the speed of RSA have to do with anything?
If you make an RSA key so big it'll take the lifetime of the universe to crack if you turn all matter into cracking machines, it'll also take a day to encrypt anything. This is not true about other algorithms.