An IoT application can take anywhere from weeks to years to complete, depending on the size and complexity of the project. The most important factor in determining the timeline is the experience of the IoT development company. A company like Wegile that has developed similar applications in the past will be able to give you a more accurate estimate.
Another important factor is the number of devices that need to be connected. A small project with only a few hundred devices can be completed much quicker than a large project with tens of thousands of devices.
Finally, the level of customization will also affect the timeline. If you need a very specific solution that is not already available on the market, it will take longer to develop. However, if you are using off-the-shelf components and just need some basic integration, the project can be completed relatively quickly.