A few gifted gainers can sometimes gain 3 lbs in a day now and then. For most this is just beyond their capacity.
However most could manage 3 lbs per week with a concerted effort. Getting weighed on Monday morning and then eating to gain. Another weigh in on Friday morning to see how much effort will be needed Friday Saturday Sunday to meet the goal on Monday.
I call this The Rule of 13 because there are 13 weeks per season or per every quarter.or 3 months.
If a gainer were to accomplish this 3 lb gain minimum that would amount to essentially 40 lbs in 3 months and if able to continue 160 lbs in a year.
In a nutshell breaking gains down to small attainable increments can add up to monumental results.
4 years
