As a datapoint: when we (https://circleci.com https://circleci.com) did our market research, we estimated that a development team spent about 12% of its time on

As a datapoint: when we (https://circleci.com https://circleci.com) did our market research, we estimated that a development team spent about 12% of its time on the parts of testing/deployment that we would replace (mostly setting up a CI server w/ continuous deployment).