Typical session 500 to 1000 revolutions

Hello

On  http://www.nauli.org/category/learning-nauli/ it is written

“Regular nauli practice: Once a regular nauli practice is attained, a typical session involves 500 to 1000 revolutions and requires about 15 minutes,”

I can hold static nauli about one minute but is seems me difficult to do 500 revolution in one session.

Is there some tips:

  Are the lung empty at the maximum ? ( as it could be for a good practice) or near empty .

What is the rhythm:  nauli time ?  break time ?  or how many inhalation between each nauli ?

An other remark 15 minutes is 900 seconds if nauli is done for 500 seconds and 400 seconds break that means 2 revolutions per second to do 1000 revolutions it seems me very fast.

Thank you