As my friend told me he say that I just need to post atleast 5 post per day with 30 minutes minimum interval but it really depends on you if how many post you will make everyday.
Waiting time between forum posts is calculated with the following formula:
waittime = 360;
if(activity >= 15)
waittime = (int)(90 - activity);
if(activity >= 60)
waittime=(int)(34.7586 - (0.0793103 * activity));
if(activity >= 100)
waittime = max((int)(14-(activity/50)), 4);