Rana currently only does CPU vanity and PoW generation of keys. The time depends on your CPU. The type of CPU, clock speed, number of workers/threads/core count etc. The number of hashes it churns depends varies from CPU to CPU.

For me on an Intel 10th gen intel i7 10875h with 16 threads clocked at 4.9 Ghz it took about 3 hours to mine a PoW 34 bit key with leading zeros.