The phrase "tight timeline" means that there is not much time available to complete a task or project. It suggests that the timeframe is limited and may require quick and efficient work to meet the deadline. Full definition
Recruiters work on tight timelines because of the mandates determined by their clients. (downsizewithdignity.com)
Though we often are in the midst of tight timelines, taking that extra few minutes to help an ID improve their skills and course design is something I love to do. (elearningindustry.com)
Six weeks is an extremely tight timeline for me so any project that would require renovations would be completely out of the question. (stephaniekrausdesigns.com)