This is the 290th most frequent Arabic word.
لمدة
"For a duration" or "for a period."
The usage of 'لمدة' in this sentence indicates the duration of time the action of waiting took place.
انتظرت الحافلة لمدة عشر دقائق.
I waited for the bus for ten minutes.
Here, 'لمدة' is used to specify the time span of her staying at the hotel.
ستقيم في الفندق لمدة أسبوع.
She will stay at the hotel for a week.
In this example, 'لمدة' denotes the time frame during which the waiting was required.