How much data should I consider acquiring for my eSIM, particularly when embarking on a journey that spans multiple destinations? Is there a precise calculation or a specific formula that can assist in determining the appropriate amount of data needed for seamless connectivity while traveling? Given the myriad of factors such as the duration of my trip, the frequency of my data usage, and the types of activities I anticipate, how can I estimate a suitable data allowance? Should I factor in the potential for streaming services, social media accessibility, or the necessity to navigate through unfamiliar terrain with GPS applications? Furthermore, might it be prudent to account for the possibility of needing additional data for unexpected contingencies or extended stays? In the estimation process, how can I ensure that I strike a harmonious balance between sufficient data and budget considerations? Ultimately, what strategies can enhance my decision-making process surrounding this critical aspect of international travel?