How often should I replace the spikes of my golf shoes?

I was looking at my golf shoes the other night and noticed that a lot of the spikes towards the toes of my shoes were broken off. I have the Softspikes Pulsar Fast twist spikes currently in my shoes. If the front spikes break, should I replace all the spikes or just rotate the ones from the back to the front and continue that process? How often are new spikes recommended?

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