After decades of riding I can tell you the correct answer is... more than single digits and less than 3 digits.

You need to put in the time and the effort. If you don't put out the effort to ride faster you won't. If you don't put out the effort to ride farther you won't

That said, as part of real life lessons, no matter how much you try, you may never be as fast or ride as far as others who put in far less time. Life is not the special olympics.

You do the best you can, work on improving, and after that you embrace your lot in life.

I ride fast enough to not really be fast and short enough distances not to be long. I have always been one who will ride hard over 15-25 miles, but never had a desire to ride for hours on end. In that respect I am a ripe-early-spoil-late rider and as I get older I sometimes just spoil early and late. I'll go on 50+ mile rides, never did a century, but it takes more time than I want to spend (I know it is an odd comment for this forum). But road hills and mountain biking has been helpful in building up strength over shorter distances.

John