Hey oneiroer! It's different for everyone. It could take anything from a day to a month or even more. It would also depend on how often you do those and how mindful you are. The greater the quantity and quality, the higher the chances that these will show up in dreams. Keep up the good work and let us know when then do show up. I think this is pretty cool experiment in itself to see how and when our thoughts and actions are incorporated in dreams.