I suspect you really want to hear the maximum rate, not the average rate.
An imprecise guesstimate would be the maximum progression rate to expect for a young, fit, talented, dedicated leader in an am-am couple would be one syllabus level per year, if they take frequent (ie weekly or more) private lessons and practice regularly with feedback both solo and with partners. That's 1 year each for Newcomer, Bronze, Silver, Gold before entering Novice, the first of the Open levels.
The average (the mean) is heavily weighted by the bottom of the pyramid. Very few dancers gain silver level proficiency. So, the average dancer never reaches Open. The median dancer never reaches Open.
Maybe you mean
of those dancers who do reach Open, on average, how long did it take them. I was curious about this myself so I mined the data of o2cm (a place where results are searchable) and saw that the intercollegiate dancers tend to move up faster than the senior dancers. Not an earth-shattering conclusion. Applied to yourself, judging from your photo on DF, you might progress faster than average due to youth.
to be proficient enough for them to compete openly rather than bound by syllabus competitions?
I will take it you mean "to be competitive at the Open level", since anyone is
allowed to enter a higher level than their proficiency.
But the real question here carlosyabrudy is "Why would you want to pass thru the syllabus levels rapidly?"
Enjoy the journey. Syllabus was designed to guide and measure learning. If you think dancing Open will allow you more freedom to express yourself, be aware of the required prerequisite skill: ability to execute intended action.
I'm so glad you asked! Another chance to climb on my favorite soap box and howl.
