Final answer:
For a client with cardiac arrhythmia and weighing 63 kg, ibutilide IV is typically administered over 10 minutes according to standard dosing guidelines.
Step-by-step explanation:
A client with cardiac arrhythmia who is prescribed ibutilide IV and weighs 63 kg would typically expect to have the drug administered over a 10 minutes period. This timeframe allows for a controlled infusion, decreasing the risk of side effects that could be associated with a too rapid administration. The correct answer to this question is C) 10 minutes, based on standard dosing guidelines for ibutilide.