How long should Outdoor Solar-Powered Tiki Torch Lights last under normal use?

Moonrays 91206 Solar Powered Tiki Torch Path Light by Coleman Cable Moonrays 91206 Solar Powered Tiki Torch Path Light by Coleman Cable 3.8 out of 5 stars See all reviews (6 customer reviews) | Like (4) List Price: $17.98 Price: $16.56 & eligible for FREE Super Saver Shipping on orders over $25. Details You Save: $1.42 (8%) In Stock. Ships from and sold by http://Amazon.com. Gift-wrap available. Want it delivered Tuesday, July 19? Order it in the next 20 hours and 21 minutes, and choose One-Day Shipping at checkout. Details 3 new from $16.56 2 used from $14.69 Product Specifications Brand: Coleman Cable Part Number: 91206 Item Package Quantity: 1 Power Source: cordless-electric Batteries Included?: Yes Batteries Required?: Yes Technical Details Solar Tiki Torch Glows at night and charges during the day Flickering Amber LED looks like real fire Includes rechargeable batteries Stands 59-Inch above ground(about 5 feet) Safe Alternative To Oil Torches And Candles Product Description From the Manufacturer Solar party torch is safe alternative to oil-based torches. Durable plastic and bamboo construction. 1 amber and 1 flickering amber LED simulate the flicker of a candle, and AA NiCd battery (included). 59.25-Inch above ground height. Product Description SOLAR PARTY TORCH - Solar party torch is safe alternative to oil-based torches. Durable plastic and bamboo construction. 1 amber and 1 flickering amber LED simulate the flicker of a candle, and AA NNiCD battery 97125 included. 59.25 above ground light. Product Details Shipping Weight: 1.7 pounds (View shipping rates and policies) Shipping: This item is also available for shipping to select countries outside the U.S. ASIN: B001E3JJUY Item model number: 91206 Average Customer Review: 3.8 out of 5 stars See all reviews (6 customer reviews) Amazon Bestsellers Rank: #1,370 in Home Improvement (See Top 100 in Home Improvement) #5 in Home Improvement > Lamps & Light Fixtures > Outdoor Lighting > Path Lights #14 in Home Improvement > Lamps & Light Fixtures > Outdoor Lighting > Solar-Powered Landscape Lighting #17 in Home Improvement > Lamps & Light Fixtures > Outdoor Lighting > Landscape Lighting & Accessories Would you like to update product info, give feedback on images, or tell us about a lower price? Source: http://www.amazon.com/Moonrays-91206-Solar-Powered-Torch/dp/B001E3JJUY