Typical Working Conditions for CNAs. Typical Working Conditions for CNAs. While working conditions for certified nurse aides vary depending on the facilities where they choose to work, some of the most common working conditions they encounter are briefly described below. Common Work Schedules. Although nurse aides can choose to work part- or full-time, most facilities are in need of those who are able to work full-time hours. This typically means 40 hours or more per week and can include overtime, weekend, and holiday hours.