Limit of zero padding

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I have a signal in energy. But it's not from zero to E, but from A to B. It has N data points. If I add 2.5N zeros to the left of A, I will have a good enough signal in time after Fourier Transform. However, is it too much zeros to add? How much zeros can be added without producing too much artifacts in the signal?

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hotpaw2 On

Zero-padding before an FFT or DFT just results in the interpolation of more points on the same spectral result curve. You can zero-pad by a very large number if you just want a lot of smoothly interpolated points between the non-zero-padded FFT result.