I have an answer for your doubts.It is a must.Else many will open pole or articles and without reading them will post comments just to get points.If not checked it will become a practice and I think within two posts reading 1 minut waiting is good.Won't you take one minut to open, read and post your comments ????
as abid and lohit said, it may be ok for keeping 60 seconds difference in posting comments on articles.. but its totally waste of time in posting comments on polls.. maximum 30 or even 20 seconds itself is enough on opening the poll , vote and comments on poll section..
so it is necessary to reduce time on to post comments on polls
For articles there is no question of asking less than 60 seconds time limit as it is the far lesser time that you need to even read a single para of the article.
For polls you may not need 60 seconds to read the title but you will definitely need it at least for reading all options, voting and finally writing the comment. So why you are so much concerning about the 60 seconds time limit?
ya.. rakesh is correct.. some polls can understand by question itself and it contains only two options and it is easy to comment within 30 seconds itself...so it should reduce time in posting comments on polls.........