My son has an Equinox 8' x 10' tarp (from Campmor) that he has used for about 10 years without incident. He has an ENO double nest without a ridgeline. When he started using the tarp, he was probably in elementary or middle school and was less than five feet tall. Today he is 6'1" and still uses the same setup. In other words, the shape of the loaded hammock has changed considerably during this time but the tarp has handled it.
Weather wise, he's been in warm, dry summer nights, a "gully washer" in the Linville Gorge, windy, chilly nights in the Adirondacks and pretty much everything in between. He's hammocked down to 11 degrees but not with this tarp, IIRC. He only camps a time or two a year at this point due to other interests, work and college so I don't know how his skills are now but when he was mid-teens (he's 19 now), he actually impressed me when he set up quickly but then pointed out how he had determined the prevailing wind direction and selected trees perpendicular to the wind and behind a small windbreak of some sort. Knowing how to use a tarp is always paramount to a satisfying night's hang when the tarp is needed.
He uses an A frame setup, not diamond. By the way, I used the same tarp on a ground camping trip to the Catskills with my son and daughter when they were about 8 or 9, maybe 10 years old and we had no problem getting us, our gear and the dog under the tarp during a night and a day of rain.
Hope this helps you understand the capability of a 10' tarp.
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