Hi. If the interview went quite well, LOA is usually issued about 5 days after. If your mailing address in your application is Manitoba, your sponsor might receive it in a week or so. If your mailing address is your home country, it usually takes a couple of weeks to arrive. Keep your fingers crossed
Here's my timeline:
MPNP Online Application Nov 19, 2011
Sponsor Interview Jan 4, 2012
LOA Jan 9, 2012
PRV Application to CIO Mar 29, 2012
Credit Card charged April 17, 2012
AOR CIO April 24, 2012
Waiting for AOR VO.
Good luck to you!