That is over-simplistic and impossible to determine.

It could be less than a Second, or it could be a lot more than ten Seconds.

1. It will vary from day-to-day with temperature, humidity and the type of Components you've used. And if you are going to precisely adjust your Resistor with a variable such as a POT or Trimmer, then your component cost is already more than a crystal (and that's not even factoring-in any labour).
2. The ONLY thing you can guarantee with a Capacitor is that it is NOT the value that is printed on it's case. This is TRUE! Try measuring the value of any Capacitor that you have.
3. I can show you two Resistors... one you'll buy four for a cent, the other costs eight dollars... but they're both the same value and the same wattage... but they will behave completely differently.
4. I can show you two Capacitors... one you'll buy for two cents, the other costs almost ten dollars... but they're both the same value and the same voltage... but they will behave differently too.

If you are considering RC oscillator for time-keeping, then let me know what your finished product is - I'll need to know in order to avoid it.