Yes, they claim 1 hour - but 24 hours for safety.
It's not so bad if you have a big route already rigged and are putting these in as a regular route which is what we did at Coniston.
The cost is the killer at about £8 per anchor.
The finest workers in stone are not copper or steel tools, but the gentle touches of air and water working at their leisure with a liberal allowance of time.
Henry David Thoreau