From: Tom Zander <tomz@freedommail.ch>
To: Bitcoin Protocol Discussion <bitcoin-dev@lists.linuxfoundation.org>
Date: Sun, 16 Oct 2016 18:42:26 +0200
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Subject: Re: [bitcoin-dev] Start time for BIP141 (segwit)
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On Sunday, 16 October 2016 12:35:58 CEST Gavin Andresen wrote:
> On Sun, Oct 16, 2016 at 10:58 AM, Tom Zander via bitcoin-dev <
> 
> bitcoin-dev@lists.linuxfoundation.org> wrote:
> > The fallow period sounds waaaay to short. I suggest 2 months at minimum
> > since anyone that wants to be safe needs to upgrade.
> 
> I asked a lot of businesses and individuals how long it would take them to
> upgrade to a new release over the last year or two.
> 
> Nobody said it would take them more than two weeks.

The question you asked them was likely about the block size. The main 
difference is that SPV users do not need to update after BIP109, but they do 
need to have a new wallet when SegWit transactions are being sent to them.

This upgrade affects also end users, not just businesses etc.

Personally, I'd say that 2 months is even too fast.
 
-- 
Tom Zander
Blog: https://zander.github.io
Vlog: https://vimeo.com/channels/tomscryptochannel