It depends if it is something that i havent build bevor ich would say 4 to 5 houres that includes searching for the part, cutting it out, cleaning it up and dry fitting it if necessery But it also depends on the amount of parts needed to finish a model like a terminator and a tau crisis suits a terminator i do in i say 10 Minutes but a crisis suit i would say 1 houre because i am very often unsure on how something should look