The maximum allowed practice before any game consists of 2 speed shots and 8 practice shots.  However, you are not required to take all of the allowed practice shots.  You are free to choose any amount of practice less than the maximum.  If, for example, you wish to take only 4 practice shots, you may do so.  Remember, however, that each player on the court is entitled to take the mamimum practice if he/she so chooses.