It's 13 eighth-notes long; the first note lands on "one-and-two-AND" in the bar (you can hear him do the full guitar part later in the song, about a minute in, before the "Cookie!" bit).
That edit can be heard on most releases (ie it's the standard version of the song). However, from what I can tell, in 2003 Mobile Fidelity Sound Labs (MoFi or MFSL) put out a version containing Yoko-sanctioned remixes of the songs (I think the mixes were done for a Capitol release in 2000).
A lot of people seem to hate the remixes for changes in reverb, compression etc. Whatever. The MoFi version (not sure about the Capitol one) contained the full intro to Hold On :
I thought people here might not know about this. I heard about it a couple of months ago but forgot to share it until now.
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There's also a second 'Cookie!' at about 1.09 in the above clip. I'd honestly never heard it before today, but I just checked and it's in the original mix too! Well I never. I love the fact that a song I've known for 25 years can still contain surprises.
I realise I'm probably the last to know this. I, I found out.
1 May 2011
1 May 2011
"I told you everything I could about me, Told you everything I could" ('Before Believing' - Emmylou Harris)