lately i've been having up to three x 2000mg of ginkgo daily, and many days over the last couple of months i've had 10 ginkgo .... i dunno if they're called berries or nuts, but yeah ten of them. my mother in law said any more than that and they can be a little harmful. i would either do my supplements or the fresh stuff.
60mg.... you'll be fine.
check out my thread on an interesting side effect i found on ginkgo
http://www.bluelight.ru/vb/threads/519363-ginkgo-biloba-time-dilation?highlight=ginkgo