营业 is specifically about commercial business operations. 营业时间 (yíngyè shíjiān) = business hours. 营业额 (yíngyè é) = business revenue/turnover.
culture
Chinese stores often have signs saying 正在营业 (currently open) or 暂停营业 (temporarily closed). During Chinese New Year, many small businesses post 暂停营业 for the holiday.
