The Lucy spacecraft has wide solar arrays that are folded up for launch. It will then deploy them once in space.
At what moment of the Lucy mission (2021) will its solar arrays be deployed? As soon as it is in space?
One hour after launch.
"At about one hour after the spacecraft launches, the solar panels will need to deploy flawlessly in order to assure that we have enough energy to power the spacecraft throughout the mission,” said Principal Investigator Hal Levison of the Southwest Institute in Boulder, Colorado. “These 20 minutes will determine if the rest of the 12 year mission will be an success. Mars landers have their seven minutes of terror, we have this.”