Spartan 2 I2C update rate

So I am 1/4 way through my data logger build for my ktm 990 and I have 2 spartan 2 I2C modules and I am using STM32 controllers for this build.

Now I need to know what update rate would be best to use? I was originally going to use 10ms, but that might be too fast.

What would be the suggested update rate be?

I got a update, it should be between 25 and 50ms.