How to watch ad to speed-up production

@JdKmaths It resets 00:00 everyday, 8 ads per day. When you tap the factory, ad starts. It takes 2-3 mins till you can watch next ad. Every times the interval gets longer. Try to pick one factory and set items you want to speed up, and I dont touch other factories until you watch all the 8 ads, so you won’t accidentally waste ads for unexpected production like metals.

This factory speed up ads are only for non-pay players. Once you pay for the game, ads won’t show up. 

Hope this helps. 

I've never seen an ad on a factory of 5 metal or wood. Is this new? I always exist on a factory making all wood or metal to avoid the ads

The speed-up factory production isn’t active for metal and wood, because you can produce them really fast- it only works for plastic, seeds, minerals etc. that take longer to produce.

Usually you get this feature 10 times per day, but  if you spend real money on the game (even for once!!!) this feature (alongside others) is permanently lost. Take care

Initially when these ads were added they used to be activated also with wood and metal, I have been surprised by the fact that is no longer the case and I have been suffering for a long time with this. The change also makes me realize that EA at the time read and heeded the complaints posted at the time, but simply removed wood and metal from the ads. So today we can be sure that they already heard the suggestion to place a button so that we can control these ads but they rejected the initiative and persist in invasive ads.

Even so, it is not a problem because by not activating with metal and wood they practically gave us an exit. I am very grateful to have read these suggestions. I appreciate that. 

Btw, isn't ironic that EA secretly create functions to lead to spending more money in the game as in this case for those who have paid and lost this feature, at the same time they create a forum for users to share their experiences with each other and discover these traps. LOL ¡whoops!