HI Puneeth,
All the fields in Data Warehouse are brought in based on last_updated_date.
When the Load Data Warehouse job starts running, it gets the current date and will pick up everything that was updated before this date.
This is valid for all the fields/data. If the project manager just updated the field he must wait until the next run picks the data up.
You should also be aware that Data Warehouse is not meant to be a real time reference, it's a reporting tool. So users should not be expecting an immediate update to DWH. We have customers who run it once per day only.
Hope this helps -Nika