And yes, 4000 hours is a good minimum number for single pilot operations in a complex turboprop because you cannot always guarantee the near perfect benign weather of W.A. in winter.
The mob I worked for in the Territory in the early to mid 80's had 3 Conquests. Most of us had around 2000 hours when we first got to fly the Conquest, usually about half of which were in 310's and 402's, the rest in 210's.
The Conquest was somewhat quicker than our previous aircraft but most managed the transition comfortably including regular operations from ASP to ADL & MEL all year round and the usual wet season adventures in the Top End.