Following up on Millie's post -- I made a little slider example that does what she said in the last section. This slider is animated (60 view events per second), locked (not interactive for users in Interact mode) and volatile (doesn't save the value stored in it between sessions).
%%WGT0{"w":[{"name":"timerslider","type":"slider","size":[100,25],"pos":[152,105],"locked":1,"animated":1,"volatile":1,"script":"on change val do\n\nend\n\non view do\n if me.value=180 #60 frames per second x 3#\n me.value:0\n go[\"Next\"] #change this to the name of the card you want to go to#\n else\n me.value:me.value+1\n end\nend","interval":[0,180],"style":"compact"}],"d":{}}
And, explaining the script contained in it:
on view do if me.value=180 me.value:0 go["Next"] else me.value:me.value+1 end end
Or, to explain it more casually:
on every view event (60 per second on this animated widget) IF my stored number has reached 3 seconds (180 = 60 frames x 3) reset me back to 0 then go[] to another card ELSE (in any other circumstance) make my stored number go up by 1 end (for the if statement) end (for the on view do)
Technically I made a "Count Up" rather than a "Count Down" but I hope it makes sense anyway! You're welcome to use or deconstruct this example for your project.
More notes:
Probably change the go["Next"] to have the name of the card you actually want it to go to?
A live countdown timer can be a little annoying while testing your other interactive elements... But it should be fine if the rest of the card is ready.
If it's annoying while testing anyway I can explain a way to make it easier to work around while editing your project. I wanted to keep it simple for this example.
When everything works how you like.... set this timerslider widget's visibility to "None" so your players can't see it. :)