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Regarding optimal size of gvcf file generated by Haplotypecaller

Hi everyone,
I am running Haplotypecaller to generate individual gvcf files of 50 samples of Cattle (Bos taurus) after removing Illumina adapters from 30x raw reads with ~ 120 bp read length. Haplotypecaller has generated gvcf file which size varies between 4 to 17 GB. My question are:
How can it be determined that Haplotypecaller has successfully run? If it has successfully run why size of generated gvcf file has varied?
Is any method by which a expected size of gvcf file can be calculated ?

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