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3 days. See http://bellard.org/jslinux/tech.html , linked from the page source.

uname -a shows

Linux (none) 2.6.20 #3 Sat May 14 19:08:30 CEST 2011 i586 GNU/Linux

I wonder why he chose this kernel version instead of the latest

Not long ago:

Last-Modified: Mon, 16 May 2011 21:14:50 GMT