How quick can I read the Qur'an

I get this asked of me by so many parents of new children with the expectations that I could actually give them a definitive answer.

In reality, it all depends on how much work you do with your child at home, and, most importantly, at what age they are starting.

There seems to be this expectation that a child of 4 or 5 years should be able to read the Qur'an independently in a year or two.  In some case, I agree.  I have personally come across a 6 year old who has read the entire Qur'an masha Allah.  However, this is a very bright child who is home taught and reads with his parents for a couple of hours a day, without fail, even at the cost of any other school work.

The majority of kids come to a Saturday Islamic Club to memorize Sura's as well as learn how to read the Qur'an.  Baring in mind that, on average, a child does an hour's homework/practicing what they were taught at school during the week gives you an average of 2 hours a week dedicated to learning how to read.

Simple mathematics tells me that, using the above benchmark, it would take a child two years to be able to read three letter words independently, with all the vowel symbols, and then at least a further three years to be able to apply the most common tajweed rules and read the calligraphy of the Qur'an (depending on the style that you chose).

So, now that I have said four years, I am certain that I will be challenged in both directions.  On the one hand, I will get the "my cousin's son managed to read it in two years" and an the other, I will see parents slacking with the expectation that we do not have to do anything and just let the school teach them an hour a week and "hey presto" my son can read the Qur'an.

Now this brings on another question - how important is tajweed?  Granted, your son can read Qur'an after a year, but can he read it with tajweed?  Does it matter to you?

What is more important - a younger child who can read the Qur'an with wrong pronunciations or an older child who can read with tajweed AS WELL as has a key understanding of what s/he is reading?

I know where I would vote, but what do you think?