Hopefully very little.

https://pool.viabtc.com/pool/bcc/state/


Was ~17 Ph an hour ago. Now ~80 Ph, and rising.

1 block left!!

Guys I wish you a very soft splitting

Best practices to be safe on the fork. Hopefully this will help some people that are still confused:

1-    Wait until after the fork when a few BCC blocks have been mined. There is no hurry, you can wait a day, a week, e
tc. Copy the BTC private key where you have your BTC funds.

2-    Move all your bitcoin BTC to a new wallet with a new private key. BCC has replay protection, so you will be able
to move your BTC without moving your BCC.

3-    Wait until your Bitcoin BTC is confirmed in the new wallet. Be sure to complete steps 1-3 before moving to step 4
.

4-    Install a Bitcoin Cash (BCC) wallet and enter the private keys of the original wallet (the wallet you just moved
your Bitcoin BTC out of). To be maximally safe, the BCC wallet should be installed on a different machine than the one
that has your new Bitcoin BTC wallet on it. You can find a list of BCC wallets on the Bitcoin Cash website.

5-    This step isn’t necessary, but as a final step you may want to move your BCC to a new BCC wallet with a new priva
te key, just to help ensure you don’t mistake your BCC wallet address for the BTC address it used to be.

Yes.  Block #478558 should activate the UAHF rules.

Edit: And it's just arrived!

The rules are live (in a sense).  The next step is to build a block greater than 1 MB in size, extending block #478558.

#Bitcoin: Current height: 478559, #bitcoincash: Current height: 478558 - has it forked?
 https://twitter.com/bitcoinholder/status/892375666007703552

Yes it has, and there are now enough tx in Bcash mempool to mine a >1MB block

So, yeah, it happened.

Another confirmation (from Bcash chain)

Chain split detected.  Weclome to a hardfork



http://imgur.com/a/0zmwF

Yep.
Chain was splitted, but  a block wasn't mined on the new chain yet.
I think it should take few minutes.
Anyway, I am just heading to sell my bcc tokens