Regeneration of cation bed and anion bed how much time will take hcl injection to cation bed

How much time should complete hcl injection time to cation bed and caustic soda to anion bed…in regeneration mode…cation bed( 288literswater+96litres hcl) anionbed (225litres water+ 32kgs caustic soda) water pressure inlet 2kg…! How much time will take and how to check…and i need sop also about process water plant.
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