Hello, Am i right that each block of 1600 will only stake once every 9 days? how long does it take to stake? and how many blocks of 1600 can i have in one day?
Nine days is a good way to figure it. I believe it was actually 8.8, so close enough for planning 

 You can have as many blocks in a day as you care to. It's probably better to spread them over several days, though, to keep the chain moving. Plus it's nice to see a daily payout. 
Yep biomech is right. As a community we need to keep the efficient movement of the blockchain in mind. We can do this by not letting our stakes all "avalanche" at once and shutting our wallets off after staking and waiting until the chain slows to fire the wallet back up.
We are still in the early phase of HYP.  Things will get much better through time.  Right now we are still experimenting with this Proof of Stake only system. And if the chain is slow as we continue to mature we can lower the maturity date and also put in some custom staking code that is specifically designed for HYP.