The amount of time a project manager estimates it will take to complete the activity under ideal conditions is known as:

pessimistic time

Explanation:

The term that is being described in the question is known as pessimistic time. Like mentioned, this is a concept used in the program evaluation and review technique known as PERT and widely used in project planning in order to estimate the longest period of time it will take for a task/project to be fully completed and/or delivered to the client. Known as a pessimistic time since it is the worst possible outcome of time spent on a project.

im almost done gimme more time to get the answer

answer; situational irony;