creating a short GIF

i have an internet cafe where clients can come in to use a computer. the way it works is that the clients creates an account, he purchase a time plan which is for how much time he can use the computer, for example if he purchase 1 hour he can use the computer for 60 minutes and after that time the computer shuts off or he can purchase more time if he want to use it more time, i am now doing a survey for my clients and as appreciation bonus i am adding 30 minutes to the account of every client who answers the survey. so i need a nice GIF showing for the client -at the end of the survey completion- how there account fills up with 30 minutes. see attached some pages of my client app so you can see the colors and theme used.