January 2018 - last edited January 2018
Thank you for reaching out.
There are limits of how many times you can use the free Warcards / DogTags / Golden Suitcase in exchange for watching an ad, and it also depends on the availability of the ads in your region. That's why it may sometimes occur that none of the above mentioned items is available for longer than the standard 15 minutes.
I hope this answers your question!
Thank you and kind regards,
About Fun community manager