analyse the ATXMEGA128A1 calculation speed

Hi all,

I have this ATXMEGA128A1 Xplained board and want to implement this for 
some noise control application. I plan to use fixed-point arithmetik 
with the largest system clock of the chip (32MHz). Let's say for this 
application I am using a sampling time of 1ms (sampling frequency 1kHz). 
By every sampling instant (every millisec) there are 100 32-bit 
fixed-point multiplications (with 32-bit integer) to be performed.

Here is the question: How can I analyse whether the system clock of 
32MHz is fast enough for these 100 fixed-point multiplication within 
1ms? How many cycles does one 32-bit integer multiplication take? Since 
I did not find the information in the datasheet so I wonder whether 
someone could help me with that.

Thank you very much!

Xinyu