I estimate it to be 6-8 hours. It really depends on how much you use the remote. Most of what I watch is commercial-less. So the remote may be used for a minute or so and then remain untouched for a half hour or longer. If you're watching broadcast and constantly flipping channels then maybe 4-5 hours. This is also affected by the age of the remote. As the batteries age they don't last as long. FWIW I replaced batteries @ about 5 years.