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Thankfully the majority of the models you can purchase arrive pretty much fully assembled. There may be the odd bit that needs attaching but it must not be a main of time consuming job. This is great as your children will be wanting to try out there new toy.
So now to some more practical considerations. As will all things battery powered they are going to want recharging. With a fresh battery you should pretty much get about 2 hours of driving period. As the battery is recharged over time the power of the battery will certainly reduce so it will not last for as long after being charged.
Although these are toy card for kids they could be quite heavy if you are planning a longer trip probably to the shops or regional park then make certain the battery is fully charged beforehand. You do not want to be far from home when the battery runs down since it means you will definitely need to push it back.