Not long - ours stopped after 7 months of use - and didn't use it intensively. I wish I had bought a table lamp that uses these hard to find bulbs to start with - wasn't aware at the time. So the first recommendation is not to buy a lamp that uses these bulbs. Second recommendation - try to find a lightbulb that lasts longer, then come back here and let us know which one works!
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Lamp LED Ergolux 13638, E27, A60, 15 W, 4500 K
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