Rewrite the following sentence using the future perfect continuous tense.
He will have been shopping for two hours by the time you arrive.
By the time you arrive, he will have been shopping for two hours.
Complete the following task based on the instruction and optional input provided.### Instruction:
Rewrite the following sentence using the future perfect continuous tense.

### Input:
He will have been shopping for two hours by the time you arrive.

### Output:
By the time you arrive, he will have been shopping for two hours.