How do you estimate the approximate deadlines for completing tasks?

To estimate approximate deadlines for tasks, I usually break down the task into smaller subtasks and assess the time for each, considering complexity and potential risks. I also take into account experience with similar tasks and possible external dependencies (e.g., waiting for responses from other teams). Then, I sum up the estimates and add a small buffer for unforeseen circumstances. If necessary, I discuss the estimate with colleagues or a supervisor to get a more accurate picture.