Pood, professional riggers often use the 10-to-1 rule of thumb for safety. In short, if you weigh 150 lbs, every piece of your rigging system should be rated at 1,500 lbs or more.
There are numerous threads on here that discuss this issue. As SGT Rock points out, one of the things that cuts down on the true strength of a line is the knot. A knot can reduce the strength of a line by up to 80%, but most reduce it by only 50% or less.
Another factor is that your "real" weight on the rigging goes up dramatically, based on how much sag there is each time, and how much bouncing around you do in the hammock. In other words, the laws of geometry and physics (think how a lever works) increase the effective weight, as do the laws of dynamics (a moving weight is very different from a static weight).
What happens is that your "weight" is no longer 150 lbs, but is a multiple of 150, and your line strength is no longer 1,500 lbs, but is a fraction of that.
You just don't want a failure when your backbone is above some rock. So, how safe you want to play it is entirely up to you. But as they say, knowledge is power.
Be safe and have a great hike.
Rain Man
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