We waited after the first draft but not after the second.Actually we did wait like a full 24 hr period. My current center was like an RG or something. and my LG was an RG too - from the first draft
If you're trying to develop a guy switching his actual position is worthwhile.
If he's old, just switch him in the depth chart.
Also, hopefully the playoffs will occur quicker than all that. I fully support a weeknight draft though- the later the start the better.