InsteLikes does not manage profiles and does not programmatically or automatically add interactions. Therefore, estimating a maximum and minimum time depends on numerous factors, making it impossible to be precise. InsteLikes users choose to fulfill your request voluntarily. The time to receive each interaction may vary depending on the "Reputation" chosen, the topic/theme of the profile, the amount of coins you offer as a reward, the additional filters chosen and the amount of people using InsteLikes at that time.
Requests with higher coin rewards are usually fulfilled faster because they appear with priority in users' Feed. Likewise, profiles with clear and well-segmented content tend to receive more interactions, as other users feel more comfortable following and liking them.
If your request is taking too long, you can increase the coin offer or check the request priority. It is also worth keeping the profile public and posts accessible, as explained in why is my order cancelled.

