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No

It will vary from house to house, but generally about 5+ hours for a three bed house with a vented system, but less time for a sealed / combination boiler system.

. Boiler noises are often caused by scale or debris accumulating on heat transfer surfaces  Having said that, we know that boilers with cast iron heat exchangers can acquire corrosion pits as they age, generally if the water treatment has been inadequate. In these areas, where the heat exchanger metal is reduced in thickness, the heat flux can be higher than the designer intended, and there can still be boiler noises no matter how clean the heat transfer surface may be after a power flush.

We would  not expect a well designed system without obvious problems to require  a further powerflush in less than five years, and generally for much longer than that if the system has been properly treated with a Buildcert approved inhibitor. However, there are too many variables and unknowns for us to give specific advice.