Quick Punch

https://youtu.be/N3qmN6pYhi0

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You have two ropes coated in an oil to help them burn. Each rope will take exactly 1 hour to burn all the way through. However, the ropes do not burn at constant rates—there are spots where they burn a little faster and spots where they burn a little slower, but it always takes 1 hour to finish the job.

With a lighter to ignite the ropes, how can you measure exactly 45 minutes?

Think about clever ways to light these ropes on fire for a little bit, then see the solution few days later in comment