A Cloud licence is for a
minimum period of 12 months,
with a subsequent 3 months notice of cancellation. Additional
Cloud licences have their minimum periods/notice calculated as if
they had been bought on the date of the initial purchase.
You do not have to take support if you prefer not to, although we
do not recommended this.
The "Support options" PDF
explains the difference between "Fully Managed" and
"Industry Standard" support