Are both these sentences (and do they mean the same):
a) "The room is always under watch by a security guard for a period of 6 hours, who afterwards is replaced by another security guard for the same time span, and so on."
b) "The room is always under watch by a security guard for a period of 6 hours, who afterwards is replaced by another security guard for the same length of time, and so successively."
b
You sentences are very word-y. I suggest simply this The room is always watched by a security guard. The guards work 6-hour shifts.
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You sentences are very word-y. I suggest simply this
The room is always watched by a security guard. The guards work 6-hour shifts.