At my branch, maybe 75% of the new psychiatrists I've spoken to are full time, but the ones with seniority are more often 0.5-0.8 FTE, even in leadership positions. Seems like once you're there a while they'd rather keep you on at part-time than have to recruit as many new people. If you want to do 0.75 there's a good chance they'd say yes, just reach out, and get everything in writing or it isn't guaranteed