Question: Tsubasa Reservoir Chronicle - How long was R!Syaoran in Fei Wang Reed's clutches?

[hungrybookworm]

I've seen a lot of fanfiction and fandom sources state that Real Syaoran was stuck in the floaty-vat-thing for about seven years, or that Clone Syaoran spent seven years with Sakura. I don't remember this in the manga, so I was wondering if it was just a fanon myth or it actually says so somewhere.

Thanks! :D