It takes about 5-10 days to recover. The blisters will scab over then you may get new blisters and new scabs. Try not to pick or scratch them because it spread it and can cause scarring. The scabs should go away on their own.
Here is one link you might like:
http://www.mayoclinic.org/diseases-conditions/chickenpox/symptoms-causes/dxc-20191277
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