How to build a delay in a workflow for task creation

[MBMRED]

I'm looking for advice on how to build a delay into a workflow (using Workflow Studio) to create tasks relative to a specific date.  

Scenario: 

Create tasks 60-days prior to indicated start date (captured in the requested item).

Caveat:  Start date may change while we're waiting on tasks to kick off.

Requirements:

1. Periodically check the "start date" on the RITM to determine if the start date has changed.
   • If changed, the delay loop should auto-adjust to the new date (forward or backward)
2. Best way to delay task creation until today's date is at/within 60-days of start date

Note: We are on Zurich.

Thank you in advance,

Mathew