Tooltip delay to hide issue.

Tooltip delay to hide issue.

Hi,
Looking for a code check & edit if I may for tool tooltip.
Here is the page in question http://www.theremotedoctor.co.uk/accaudi.html

I am struggling to apply a delay before the tooltip closes.
PC works fine click to show & move mouse to hide.
iOS click to show & click to hide but would like to apply 4 second delay for hide after first shown.

Many thanks if you can help.