Length of pipe to bend into an elliptical?

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I'm wanting to bend 3/4" PVC pipe into a roughly 7ft tall elliptical shape using a 4ft wide base. Can anyone tell me the length of pipe I will need to bend? Basically I am going to drive 1/2" rebar in the ground spaced 4 ft apart leaving 2 ft above ground. I'll slip the two ends of the pipe over the rebar to hold the structure. Thanks