To come up with duration estimates for this project, I would follow these steps:

Breakdown of Tasks: Firstly, I would break down the project scope into smaller, manageable tasks. For example:

Flooring Replacement: Remove old flooring, prepare the subfloor, and install new flooring.

Kitchen Update: Design phase, purchase of materials, installation of fixtures and appliances.

Master Bathroom Renovation: Planning, demolition, plumbing and electrical work, and installation of new fixtures.

Sequence of Activities: Determine the sequence in which tasks must be completed. Some tasks may depend on others, while others can be done concurrently. For example, flooring replacement may need to be completed before kitchen installation.

Resource Availability: Consider the availability of labor, materials, and equipment. This can impact the duration of tasks. For instance, if certain materials have a lead time for delivery, it will affect the project schedule.

Estimation Techniques: Utilize estimation techniques such as expert judgment, analogous estimation, parametric estimation, or three$-$point estimation to estimate the duration of each task. Expert judgment involves consulting with experienced individuals or contractors familiar with similar projects. Analogous estimation uses past project data as a reference. Parametric estimation consists of using mathematical models based on historical data. The three$-$point estimation considers optimistic, pessimistic, and most likely scenarios for task duration.

Account for Contingencies: Factor in contingency time for unforeseen delays, issues, or changes that may arise during the project. This helps mitigate risks and ensures the project stays on schedule.

Compile Duration Estimates: Once duration estimates are determined for each task, compile them into a project schedule or Gantt chart, outlining each task's start and end dates and overall project duration