The easiest way is through ridiculous padding. If you consider carefully and think it will take a day, say it will take two weeks. If two weeks, say six months

The easiest way is through ridiculous padding. If you consider carefully and think it will take a day, say it will take two weeks. If two weeks, say six months and so on. This is the sort of thing you do when the unthinkable outcome shifts from idle workers to late delivery: Today, it's unthinkable to management for workers to be idle. If instead it were unthinkable for the project to be late, they would have to accept some risk of idleness to create that outcome. Of course, you can always start doing prep work to de-risk the project, such as spikes, POCs, et cetera, within the planning phase. This might allow you to pad less but retain the certainty of your outcome.