iam-20380 FIFO questions

Hello,
I am currently using iam-20380 gyroscope and i am struggling a little bit with it's FIFO.
1- When we say ODR is 1000HZ and FIFO is 512 bytes. Shouldn't FIFO be filled in close to 1/2 second? Or 1 sample's size = (number of sensors * 2) so 1 sample's size is 8 bytes? then filling time will be .064 Second?
2- If a sensor is disabled will Fifo also read it's register's content or will it skip? Ex: If i am disabling Temperature sensor, will the fifo still read this register content and include it in it's buffer or it'll skip it?
3- Check attachments. Is it true fifo dump time in mSec? Or should it be in Sec??