It added this time may be re-adjusted as more details about the rocket's orbit become known.
Can the Chinese rocket fall on Indian soil? The increasing number of rocket launches is expected to drive the growth of the rocket engine market in the coming years.
Debris from the Long March 5B has had some people looking warily skyward since it blasted off from China's Hainan island on April 29, but the China Manned Space Engineering Office said most of the debris was burnt up in the atmosphere.
The rocket finally launched at 12:43.
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Long March 4B and 4C The Long March was first planned as a backup launch vehicle to the Long March 3 series for launches of communications satellites.