4000 calories a day? How much weight should I roughly gain a month?

Anonymous
Hey everyone I'm underweight and need to gain roughly 15 kg I'm on a super healthy natural hight fat hight protein diet and my intak of calories is 4000 a day some days more and I work out four times a week, only doing weights to help gain muscle and weight. How much weight should I be gaining per month? Thanks
4000 calories a day? How much weight should I roughly gain a month?
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