For one of the treats, scientists gradually increased the amount of effort required for the payoff — from one lever - press to five, then 10, then 15. (scientificamerican.com)
I felt that the only way to justify the months of effort required for this development was to charge for the newest version. (theblerg.net)
Like all great restaurant techniques, prepping ahead means there's little effort required just before serving. (tastingtable.com)