Make Image visible for a specified period

Hi, I am trying to create an effect by making an image visible between 15 and 26 seconds of each 60 second period. Any ideas of how I could do this with an expression in the opacity field?

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Welcome to our community!

 $#Ds#>14&&#Ds#<27?100:0$
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Many thanks for your help lucky.
My dolphin Freddy now makes a splash.

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