Whirly - You should try and do enough so they become second nature (particularly on the Robbo) and get to a point where they actually become fun (dare I use that word). During my AFIC course I spent one entire lesson of 1.1hrs doing 15 non stop engine offs. I had trouble wiping the huge cheesy grin off my face for hours. Even during my PPL training, I remember finishing most of the last half dozen dual trips with an engine off or two (weather/fuel/weight etc permitting). However, you must, must, stay current at doing them.
Interesting thing is that when you've learnt on the Robbo and move on to say the 206, the engine offs are non events - plenty of time to brush your teeth, have a wash, comb your hair (as my old instructor/examiner would say) with none of the dramatic lever adjusting/pulling - its all very much more sedate.
Good Luck
Balance!
[This message has been edited by Balance! (edited 17 May 2001).]