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How to Assign 16 Hours of Work to a One-Day Task in Microsoft Project

Khadija Khan Sep 30, 2026 868 views

Question details

The user needs to allocate 16 hours of total work to a single-day task by assigning two resources working 8 hours each, without increasing the task's duration.

How to Assign 16 Hours of Work to a One-Day Task in Microsoft Project

Product: Microsoft Project
Device & OS: not provided
Scenario: Assigning multiple resources to a one-day task to accumulate more total work hours than standard daily limits allow.
Observed behavior: When adding additional resources, the software may automatically adjust the task duration instead of accumulating total work hours.

Before you start

Verify that your project calendar is set up with standard 8-hour workdays and that both resources are available to work on the selected date.

Solution 1Recommended

Assign Multiple Resources and Adjust Task Settings

Assign both resources at the same time and ensure the task is not set to effort-driven, preventing unexpected duration changes.

By default, Microsoft Project might reduce task duration when multiple resources are assigned if effort-driven scheduling is active. Assigning resources simultaneously and verifying task types ensures the duration remains fixed at one day while total work hours accumulate.

Set Task Duration

Select the target task and set its duration to exactly 1 day (or 8 hours).

Open Assign Resources

Navigate to the Resource tab and click on 'Assign Resources' to open the assignment dialog box.

Assign Resources Simultaneously

Select both of the required resources at the same time in the dialog box, then click 'Assign'. Each resource will receive 8 hours of work.

Check Task Type

If the duration changes unexpectedly, double-click the task, go to the Advanced tab, and ensure the task type is set to 'Fixed Duration' and the 'Effort-driven' checkbox is cleared.

Assign Multiple Resources and Adjust Task Settings

Verify Assignments: Switch to the Task Usage or Resource Usage view to confirm that each resource is correctly scheduled for 8 hours of work on that day.

Solution 2

Configure Individual Resource Calendars

Ensure each resource has the correct working hours and days off configured so they are fully available to contribute their 8 hours.

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Frequently Asked Questions

Why does my task duration decrease when I add a second resource?

This happens if the task is set to 'Effort-driven'. Microsoft Project assumes the total work is fixed and reduces the duration because the work is now shared. Turn off effort-driven scheduling to keep the duration fixed while increasing total work hours.

How can I check how many hours each resource is working on a specific task?

Switch your project view to 'Task Usage' or 'Resource Usage'. These views provide a detailed, day-by-day breakdown of the assigned hours per resource for each task.

Can I assign different working times or holidays to specific resources?

Yes. While each resource inherits a base calendar by default, you can assign a custom base calendar or modify individual resource calendars to account for personal leave, rostered days off, or varying shift patterns.

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