A: About 5 to 6 minutes or so, as long as the whipped cream beat down stiff peaks, the whipped cream basin upside down without flowing.
Q: Where can I get light cream?
A: Generally large supermarkets have sales, I recommend LZ to buy a called 'Nestle light cream', better whipped. Those creams are sold in Carrefour supermarkets, Walmart and Metro large supermarkets. (I bought the cream from Metro hypermarket, or LZ can go to Taobao to buy it online.)
I hope the above answer I help you.