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The general field of Sun is uncertain but should be ~ 0.01 Tesla.

Thus the field for the neutron star, B ~ 5 x 10 Tesla = 5 x 10 Gauss

Next - how long does B last?

ns

7

11

ns

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If we can assume that magnetic braking is responsible for the slowing-down of pulsars, then we can calculate the magnetic field strengths at the surface. From observed dP/dt, we find that magnetic field strengths of most pulars typically lie in the range of 2 million to 2 billion Tesla (but weaker for the millisecond pulsars, magnetic field B = 3e15 sqrt(P x dP/dt).