Cook et al. (2009) and Burkhart & Burkhart (2005) disagree over the length of this process, with Cook et al. stating two to four weeks, while Burkhart & Burkhart states that it takes from four to eight weeks.
Cook et al. (2009) e Burkhart & Burkhart (2005) non están de acordo sobre a duración do proceso, que para Cook et al. é de dúas a catro semanas, e para Burkhart & Burkhart de catro a oito semanas.