I get a rattle for about half a second on almost all starts, hot or cold. Many others have reported this and it seems that start up rattle for a second is normal and not a cause for concern. But rattle for 20 seconds does not sound good. I would replace all the chain tensioners and see what happens.
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Current car
2000 Boxster 2.7l red/black
Previous cars
1973 Opel Manta
1969(?) Fiat 850 Convertible
1979 Lancia Beta Coupe
1981 Alfa Romeo GTV 6
1985 Alfa Romeo Graduate
1985 Porsche 944
1989 Porsche 944
1981 Triumph TR7
1989 (?) Alfa Romeo Milano
1993 Saab 9000
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