When do I have to act on signals?

You can act on the signals at any point of time, each model has a fixed time for the signals to be generated. You can know more about this on the model detail page. 

For example:

Intraday models like "Quick Short, BTST and Nightcrawler" are better entered earliest with the incoming of the signal itself. 

Each model is tested with a specific entry criteria. If you want to achieve the model returns your entry needs to be as close as possible to the signal. However, models with weekly and monthly holding periods offer a relatively long window to execute the signals.