Gravitational time dilation does not allow us to "stop" time in the sense of bringing it to a complete halt. Rather, gravitational time dilation refers to the effect of time running at different rates in regions with different gravitational fields.
According to Einstein's general theory of relativity, time runs slower in stronger gravitational fields. This means that an observer in a stronger gravitational field will experience time passing more slowly compared to an observer in a weaker gravitational field. However, even in the strongest gravitational fields, time continues to flow—it just flows at a different rate.
To achieve extreme gravitational time dilation, one would need to be in the vicinity of a massive object such as a black hole, where the gravitational field is extraordinarily strong. In such extreme conditions, time would run significantly slower compared to a distant observer.
However, it's important to note that the effects of gravitational time dilation are relative and depend on the observer's location and motion. A person near a black hole would experience time dilation compared to a person far away, but both individuals would perceive time to be flowing normally from their own perspectives.
In practical terms, the gravitational time dilation experienced on Earth is extremely small and not perceptible to our everyday experiences. It requires conditions of extremely high gravity, such as those near black holes or in the early universe, for the effects to become significant.
So, while gravitational time dilation can cause time to run at different rates in different gravitational fields, it does not allow for the complete stopping of time. Time continues to elapse, albeit at different rates in different gravitational environments.