Similar to the 4 on, 4 off shift pattern above, 7 on, 7 off sees employees working for a stretch of days (in this case, seven) immediately followed by the same number of days off.
A 7 on, 7 shift pattern off isn’t for everyone. Since it involves such long stretches spent either at home or at work, it can be difficult for employees to make plans in their personal time or attend things like doctor's or dental appointments at short notice. But for industries like long-distance haulage or where staff are required to work in remote locations, it often makes sense for them to work (and then rest!) for such extended periods of time.