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Needless to say that with time the double glazed windows have become quite prevalent as more and more property owners are installing them on their respective property, either for improved security, more warmth, and even for privacy.
Any professional installer will take between 1 to 2 hours for fitting such glasses, however, the larger ones might take up to four hours.
It depends on whether or not you are bricking up or taking out any certain portion of the wall for installation.