Some of the responsibilities have already been described in the previous answers. You can refer to them or summarize here all responsibilities.
In case of a doctoral research you alone might be responsible of data management as a whole. You can refer to that here.
The better the planning for data management in the beginning of the project, the less work is needed for data preservation and possible opening of data or part of the data.
Estimate the need to hire expert help to manage, preserve and share the data. Consider the additional computational facilities and resources that need to be accessed, and what the associated costs will amount to.
“Transcriptions of interviews will require [best estimate of time and effort].”