DragonFlyBSD

A day is nothing. When I ran it, it went for 8-9 days before a power outage killed it. It was recovering a hell of a lot more than was lost too. e.g. I expected to recover 19G and something like 100G was (partially) recovered so I think there's actually a bug in hammer recovery or in hammer itself.

Hopefully you have more luck than I did, but settle in. 24 hours is nothing. I hope you have ahci drives (I didn't).

I had a similar experience. It ran for 6 days and what it recovered was not very helpful. Will HAMMER2 be more recoverable than HAMMER1?

1. du -hcs roothammer/*
   -407 roothammer/PFS00000
   -53P roothammer/PFS00001
   10M roothammer/PFS00002
   -56P roothammer/PFS00003
   -81P roothammer/PFS00004
   118M roothammer/PFS00005
   4.2G roothammer/PFS00006
   301M roothammer/PFS00007
   0B roothammer/PFS00008
   -690 total

Looking in PFS00001, I find these strange sizes:
82P obj_0x0036748d01107d83
-520 obj_0x47554245444e2074
57P obj_0x71444f61676d4943
-157 obj_0xffffffff00000000
and plenty of things that are obviously text or other garbage misinterpreted as object numbers, such as obj_0x2a20745f72656c64.

all the obj_* files represent recovered data but there should be plenty of fully recovered files and directories in the PFS0000X directories.

"all the obj_* files represent recovered data"
Sorry, this was a typo. I mean obj_* files represent partially recovered data. The fully recovered files appear as you'd expect.