How often does the G change its algorithm?

Title says it all...About how often does G change up?

200+ times per year

It has been said:

Every week it have minor changes.
Every 3 months takes major changes.

Dunno if all this is truth. G wont really tell what/when he does anything.

Yes its quite disconcerting, especially if you've sold your car to SEO your biz to the top. That is why we have to spread our eggs all over the place. Invest in email marketing, forum marketing, article marketing, JVs, ...etc. Do some adsense, some CPA, affiliates, products, services, ... a bit of everything. Today someone post that he had lost his $1K per day biz bcos of the Big G dance. Haven't we all learnt from the last crisis? Many people got burnt because they poured everything they had into stocks or property when they should have diversified. The internet isn't such a different planet y'know!