Hi @raquelmsmith,
As @bhanu have already replied, there is no built-in way to save the value in the input.
However, there is a possible workaround for this - you can do it with the help of some Adalo features and marketplace component Countdown Timer.
Please see the video I’ve made how to do it:
I would advise to use this method with care; I don’t know what will happen reg. app speed if you have say 20 inputs set up like this 
Best regards, Victor.