Hey pooh bear,
It's not just Sun. Mars and Ketu only have 7 years. And 7 years of ketu is like a millennia. Moon has only 10 years. The rest are pretty long. You starting with Sun is surely not special or unique. And the 6 years of sun period will be different for different people depending on Sun's position, aspects, strength and many other factors. And Indian Engineers need not necessarily know astrology and the sun
With the heat, no one likes Sun there anyways. He has told you something he thought was special and you have believed it since they are in "Nice Things" category
Not trying to disappoint you, but Sun Dasa is just another dasa with a purpose. Every major period tries to teach us something.
If you want a reading, it's always better to post your birth details. And your Sun can be decoded by the learned members! And keep an eye on that Indian Engineer? Saying nice things when he has no idea about it.! Well, that a good start for him though, but this forum has killed it for him. Anyways, I wish you good luck