Response times of e.g. 300028ms don't seem realistic

From mongod slave during initial replica set sync:

Mon Feb 21 21:04:47 [conn17] query admin.$cmd ntoreturn:1 command:

{ writebacklisten: ObjectId('4d5d5bb8c2504987772ec41b') }

reslen:60 300028ms
Mon Feb 21 21:04:49 [conn21] query admin.$cmd ntoreturn:1 command:

{ writebacklisten: ObjectId('4d5cf8b4b47bc4ea73aa83a1') }

reslen:60 300027ms
Mon Feb 21 21:05:20 [replica set sync] 1873579 objects cloned so far from collection sd.metrics
Mon Feb 21 21:05:29 [conn31] query admin.$cmd ntoreturn:1 command:

{ writebacklisten: ObjectId('4d5ba5a96ed04dfbd093cd97') }

reslen:60 300029ms
Mon Feb 21 21:06:21 [replica set sync] 2843732 objects cloned so far from collection sd.metrics
Mon Feb 21 21:06:21 [FileAllocator] allocating new datafile /mongodbdata/sd.4, filling with zeroes...
Mon Feb 21 21:06:22 [FileAllocator] done allocating datafile /mongodbdata/sd.4, size: 1024MB, took 1.145 secs
Mon Feb 21 21:07:22 [replica set sync] 3793311 objects cloned so far from collection sd.metrics
Mon Feb 21 21:07:45 [conn32] query admin.$cmd ntoreturn:1 command:

{ writebacklisten: ObjectId('4d5ba56021d7d00ef5bbe3b7') }

reslen:60 300031ms
Mon Feb 21 21:08:02 [conn33] query admin.$cmd ntoreturn:1 command:

{ writebacklisten: ObjectId('4d5a54108d4e400d241a4a83') }

reslen:60 300032ms
Mon Feb 21 21:08:24 [replica set sync] 4694503 objects cloned so far from collection sd.metrics
Mon Feb 21 21:09:25 [replica set sync] 5568644 objects cloned so far from collection sd.metrics
Mon Feb 21 21:09:46 [FileAllocator] allocating new datafile /mongodbdata/sd.5, filling with zeroes...
Mon Feb 21 21:09:47 [conn17] query admin.$cmd ntoreturn:1 command:

{ writebacklisten: ObjectId('4d5d5bb8c2504987772ec41b') }

reslen:60 300033ms
Mon Feb 21 21:09:49 [conn21] query admin.$cmd ntoreturn:1 command:

{ writebacklisten: ObjectId('4d5cf8b4b47bc4ea73aa83a1') }

reslen:60 300034ms
Mon Feb 21 21:09:50 [FileAllocator] done allocating datafile /mongodbdata/sd.5, size: 2047MB, took 4.153 secs
Mon Feb 21 21:10:27 [replica set sync] 6470217 objects cloned so far from collection sd.metrics
Mon Feb 21 21:10:29 [conn31] query admin.$cmd ntoreturn:1 command:

{ writebacklisten: ObjectId('4d5ba5a96ed04dfbd093cd97') }

reslen:60 300033ms