Depending on:

1. The size/complexity of the building which affects the pre-test checks, equipment installation and test time
2. The amount of preparation that needs to take place
3. The access to the site which affects set up times,

Assuming the second 2 factors are within reasonable limits the 1st factor tends to mean a test time of between 1 and 4 hours:

• dwellings typically take 30 to 90 minutes for each unit
• industrial units typically take between 90 minutes and 3 hours
• hospitals, schools, large office blocks, etc typically taking up to 4 hours.

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