The 'good' news is that we don't have to consider the energy to add 24kWh to the battery because of the way lithium takes a charge.
The standard charge curve where the constant current (CC) stage (bulk charging) transitions to the constant voltage (CV) stage (saturation) is only accurate for one specific charge rate.
(This is only an example of a lithium charge/capacity curve. It is for LiFePO4, not for the LiMn2O4/LiNi cell used in the Leaf.)
In a really slow charge (L1), the CC/CV transition happens at a bit higher state of charge - maybe 80-90% ultimate. For an L2 charge, we might transition at around 70-80%.
Faster charge rates move the CC/CV to the left on the charge curve - the faster we push energy into the battery, the lower the state of charge at the CC/CV transition. In order for the battery to fully charge, it still needs to spend time in the CV stage - this saturation stage is required for lithium to reach higher states of charge.
A L1 or L2 charge can bring us to 100% consumer state of charge without having to slow much.
A DC quick charge can take us to about 80% consumer fairly quickly, but then has to slow the charge rate down if we want to charge to 100%.
A super-mondo-firehose-connected-to-a-nuclear-power-plant faster/quicker charge will go like a bat out of..well, really fast -- but only to about maybe 60% ultimate. The charger will have to slow the charge rate to work up to 80% or 100% consumer.