Could you even rent hashpower for only 1 hour? Consider SHA256
Looking at Nicehash which is the largest place to rent hashpower

https://www.nicehash.com/my/marketplace/SHA256

You got 2 servers which have up to 0.1205 + 0.0785 EH/s.

What is the total hashrate for bitcoin?

https://www.blockchain.com/explorer/charts/hash-rate

Looks like 250,000,000 TH/s. So about 250 EH/s. So you can rent max 0.7% of the total bitcoin hashrate.