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DRV110: 2s spike time reasonable?

Part Number: DRV110

The manufacturer of my solenoid valve tells me I need to flow maximum current for 2 seconds before I can be sure the valve is closed.  I can back off my current drive to about half of the maximum after 2s.  Is there a problem with using a 22uF Ckeep to get this 2s spike time?  How large can I make Ckeep?