How soon can you use re-pitched yeast?

[brewssuds]

I apologize in advance if this is a stupid question, or has been answered previously (I did a search, but couldn't find a comprehensive answer).

I'm planning to re-pitch some yeast. I'm going to pour the yeast from my current batch into a sanitized jar, and use it for the next batch. I know the maximum storage time is about 2 weeks, but is there a minimum amount of time I should wait before I pitch (I'm planning to pitch within an hour or two of harvesting).

Or would I be better off just pouring the new wort directly on the existing yeast cake? (It's only about 1 week old).

 

[Nurmey]

I just pour the new wort on to the yeast cake. It's a great way to get fast and furious fermentation.

 

[steelerguy]

I have poured right onto the yeast cake also and like Nurmey says...be ready for quite the fermentation. I mean you better use a blow off tube and not an airlock fermentation!

 

[brewssuds]

I have poured right onto the yeast cake also and like Nurmey says...be ready for quite the fermentation. I mean you better use a blow off tube and not an airlock fermentation!

Should I clean the primary in any way, or just pour as-is?

I'm brewing a Christmas ale that has a LOT of fermentable sugars... this should be interesting...

 

[Professor Frink]

Should I clean the primary in any way, or just pour as-is?

I'm brewing a Christmas ale that has a LOT of fermentable sugars... this should be interesting...

Unless the previous beer is very dark or very hoppy, you shouldn't have to.