me-time; time for oneself
A casual, modern term for personal time spent on one's own interests, relaxation, or self-care, free from work or social obligations.
I value my me-time on weekends.
I'm so busy I can hardly get any time for myself.
The phrase 自分の時間 is a more literal 'one's own time' and can be used in broader contexts, while 自分時間 is a trendy, compact noun specifically for personal leisure or self-care time.
A modern compound of 自分 (oneself) and 時間 (time), likely a calque or parallel formation to English 'me-time'. The exact origin is uncertain, but it gained popularity in the 2010s as a lifestyle term.