There are two cases where a one day course would suffice. The first is for previously trained operators who are in need of refresher training. This would have a maximum of three persons attending. The other occasion where one day would be sufficient is where one experienced operator is in need of formal training and testing. RTITB approve a course of seven hours duration for this type of candidate. All training should meet with the minimum accredited recommended training durations as described elsewhere on this site.