It's in the instructions. If all the readings are ok its 15 minutes plus cleaning out the condensate trap if theres any muck in it which can add the same again. If it doesn't get the correct readings it can turn into 2 hours!
Lol, why would you feel better if it had taken him 4 hours for 70 quid?. Look at it this way he has given you 3 hours and 50 minutes of pure free fun time
well you can always go out and buy the 4-600 pound, gadget that was able to take the readings, to see if your boilers burning right.then gain the knowledge on how to use it and adjust accordingly.then pay up to 100 a year to recalibrate the gadget(analyser).then fork out hundreds on repairs cos it will proberbly break after 2 years.
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