num, mydict = 10, {"Words":['hi', 'bye', 'goodbye']}
print {k: [i for i in v for j in range(num)] for k, v in mydict.items()}
Output
{'Words': ['hi', 'hi', 'hi', 'hi', 'hi', 'hi', 'hi', 'hi', 'hi', 'hi', 'bye', 'bye', 'bye', 'bye', 'bye', 'bye', 'bye', 'bye', 'bye', 'bye', 'goodbye', 'goodbye', 'goodbye', 'goodbye', 'goodbye', 'goodbye', 'goodbye', 'goodbye', 'goodbye', 'goodbye']}