Flixotide usually takes about 3 weeks to have it's full effect. But you might see improvements earlier than that.
I am not sure if there is a 'standard dose' as such for Flixotide, it depends on the strength of the Flixotide and the patients history (severity, regularity of asthma etc).
I hope it continues to do the trick for you.
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Mum to:
DD 8 - Nut allergy, anaphylaxis, environmental allergies, asthma
DS1 6 1/2 - Food & environmental allergies, asthma, eczema, Coeliac disease
DS2

11 months - Food & environmental allergies, reflux, eczema