like i saw one do four tests in a day
...I'd say that's a very long day. I allocate a half day for each test. With the initial briefing and a verbal assessment of whether or not they are going to pass (I don't fail people, I just don't do the test if I don't think they're ready) and the actual test taking about an hour and a half, it takes a half day. I start by asking where abouts in CAP413 they can show me emergency procedures (for instance). If they say 'what's CAP 413', I abandon the test. I must also say that I find it quite taxing and tiring, even after having done 50+ tests. It's a welcome relief to do some instructional flying afterwards! Actually, I'd earn more from 2 hours flying, so I try and book tests for wet days, not always possible.
TOO