How many hours are there in 46,000 years

We know that,

1 day = 24 hours

365 days = (24 × 365) hrs

so, 1 ordinary year = (24 × 365) hrs  [ 1 ordinary year = 365 days ]

so, 46000 years = (24 × 365 × 46000) hrs

I think You can multiply on your own now to get the final answer.