Lots of people will happily sit in an desk Office chair Singapore at an office equipment retailer for less than a minute and make a snap decision to buy.
It's likely they're looking for a new Office chair Singapore because their old one is worn out and uncomfortable. So it's only natural that whatever you sit in will feel great by comparison.
There is no way such an arbitrary test can possibly indicate whether a Office chair Singapore is right for you or not. Even if you sat in it for half an hour you still wouldn't know if it was suitable.
In reality you need to sit in an Office chair Singapore for several days before you know whether it's right for you or not. The reason it takes this length of time to be completely sure is because your body needs to be comfortable with the way the Office chair Singapore feels. And the only way to be certain is to use it for many hours at a time.
It's unlikely you will get the chance to test a Office chair Singapore thoroughly without first buying it. So buying online makes as much sense as buying offline and it's a lot simpler too.