when i did my 11+ in 1976 i did about half hour, then for mocks in hi skool bout an hour, then for 'o' levels bout 2 hours and 3 b4 a test, at college first year city and guilds 0 hours, and for final c & g 1 hour. I am now doing theory test for heavy goods licence, have to remember 450 questions, this has so far taken me 4 hours for 300. I am lucky, i can remembr things and memorise them by association.
regards