Are you making a Helles or a Dopplebock? Big difference as one is a lighter, easy drinking beer and the other is darker and packs more of a punch!
I'd go s05 if you don't want to lager it. It's cheap and about as neutral as you can get.
I typically get my lager yeast and make a 5...
A lot of it depends on your reason. If you are doing it for clarity, you could leave it for a month. If you are adding fruit or dry hops to the secondary it could be anything from 3 days to a few weeks.
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If it's aluminum you may have to come back the next day. If it's steel, you can swap but I'd just go to www.tuxedoparkbrewers.com and do a swap with them. Good guys and a good store for supplies.
1 - You might get some off flavors but the beer will be OK. A guy brought in some warmer fermented beer and I think it was S-05. There was some clove type flavor in it.
I think the first 72 hours are key. You could try to get it down to 70 or so and it might still help.
Fermentation...