How many pieces for core of staple coil?

[Cole Rosenfield]

I am going to make my first staple coil tomorrow, and i dont know how many pieces of flat wire to use for the core. I know if i use 0.5x0.1 i would do 8 pieces, but all i have is 0.9x0.1 so im going to use that. BTW im using 36g Nichrome to wrap it.