One professor even went through my entire procedure, painstakingly -- I'm not really sure where he got all this time -- and he went through and said why each and every step was like the worst mistake I could ever make.
Un professor va revisar tot el procediment acuradament —no sé d'on va treure tant de temps—, va revisar-ho tot i minuciosament a cada pas va dir per què cada cosa era el pitjor que vaig poder fer.