A new proto Mini 650 (no forms for hull and deck) takes about 1500-2000 hours to build by professionals with all professional tools
available.
For a self builder you may minimum ad another 500 hours due to lack of routine and professional tools, thus 2500 hrs.
Your possible schedules could be the following:
Alone:
40 hrs per month
average (5 hrs Saturday and 5hrs Sunday), gives 62.5 months = 5.2 years.
80 hrs per month average (half time job or 10 hrs in the weekend and 2 hrs every evening), gives 31.2 months = 2.6 years.
160 hrs per
month average (full time job, not possible on free time), gives 15.6 months = 1.3 years.
Two persons:
40 hrs per person per month average (5 hrs Saturday and 5hrs Sunday), gives 31.2 months = 2.6 years.
80 hrs per person per month average (half time job or 10 hrs in the weekend and 2 hrs every evening), gives 15.6 months = 1.3 years.
160 hrs per person per month average (full time job, not possible on free
time), gives 7.8 months.
Three persons:
40 hrs per person per month average (5 hrs Saturday and 5 hrs Sunday), gives 20.8 months = 1.7 years.
80 hrs per person per month average (half time job or 10 hrs
in the weekend and 2 hrs every evening), gives 10.4 months.
160 hrs per person per month average (full time job, not possible on free time), gives 5.2 months.
Four persons:
40 hrs per person per month
average (5 hrs Saturday and 5hrs Sunday), gives 15.6 months = 1.3 years.
80 hrs per person per month average (half time job or 10 hrs in the weekend and 2 hrs every evening), gives 7.8 months.
160 hrs per
person per month average (full time job, not possible on free time), gives 3.9 months.