I heard that at Holy Transfiguration Monastery they kept the Exaltation fast for two weeks, but certainly I have never heard of this fast in any other context.
Again my own point is that, if you want to increase your fasting beyond what is the norm in your church, you should get the blessing of your spiritual father. I don't think taking a solitary path and justifying it on account of the fact that you read such and such a rule in your copy of the Rudder or Triodion is a good idea, not that you are advocating this, but that this could be what some readers will take away from talk about the "normative" rule of the Church. But as long as you are obedient to your spiritual father, then certainly I'm not arguing against increasing the strictness of your fasting over time.