There is an open air ie clear line of sight range and an indoor range. Both are rather optimistic.
Maybe 200 feet in the clear and perhaps 75 feet and much less indoors. The signals do not like to go through things and any metal object between the router and laptop. The worst I have ever seen was about 15 feet but then found out there was a furnace room between with a lot of metal duct work.
You can by or build antennas that will really increase the range. A few of these claim close to a mile of range instead of a hundred feet or so. These are directional and are very inexpensive to build and if you look up coffee can antenna wifi on your search engine you will find plenty about these.
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