how much amount of carbs can be observed in a day?

Here are two options. It depends on whether or not you want to lose weight. Therefore, this question is answered in two ways.

THOSE WHO ARE NOT TRYING TO LOSE WEIGHT

If you are NOT trying to lose weight, 130 - 230 grams are sometimes recommended. However, please note that unlike protein and fats there is no minimum daily requirement of carbohydrate for good health or to sustain life.
Someone consuming 2000 calories a day might be eating even 300 grams of carbohydrates (which is a lot). If you are asking the question in relation to weight loss and low carbohydrate diets, however, the recommended intake of carbs per day is far less.

THOSE WHO ARE TRYING TO LOSE WEIGHT

If you ARE trying to lose weight, 20-60 grams are recommended. For weight loss, get your carbohydrates from natural sources such as (preferably organic) fresh non-starchy vegetables and low-carb fruits such as berries and avoid or cut right down on refined processed carbohydrates.

truth about the carbs