The minimum crew may be one pilot, but I suppose the question is if the aeroplane as being operated as multi-crew (in accordance with the Ops Manual and with CAA approval) then the second pilot can claim P2 time?
This from Bristol Flying Centre website:
Are the King Air and Citation Jet single pilot aeroplanes?
Yes, both the King Air and Citation Jet are single pilot aeroplanes. In Europe no jet can be operated public transport single crew therefore the Citation is a single pilot aircraft flown multi crew. The King Air is a turbo prop and can therefore be flown single crew however many operators are becoming 2 crew. In general terms a Captain for either aircraft will need 1500 hours total time, 500 hours multi and 50 hours on type. This is very much a general rule of thumb and will be dictated by the operators own requirements and those of their insurers.