You do not get banned or red-tagged for posting quickly. Different account ranks have posting limitations set by the forum automatically, and you can't post faster than your specific rank permission. The higher your forum rank the lower the posting waiting time
Yes, And here is how the waiting time is calculated.
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);
The maximum wait time is 360 seconds which is for newbies.
Championt, the waiting time for you is now 90-51 = 39 seconds. So, you can make 1 post per 39 seconds. But the main rule is
"DO NOT SPAM".
As Upgrade00 said, you won't be banned because of the time between your posts. Users are usually banned due to spamming and plagiarism.