birdsville to Innamincka

I would allow a day in reasonable conditions

cheers

You can do it in a full day, but allow a bit more and take your time

i drove the Cordillo Downs road from Birdsville about a week and a half back, was told by the lady at Innamincka Trading Post the road was in bad condition, but the section we drove was in great condition IMHO. we didn't drive all the way to Innamincka (we were there 3 days previous), we left Birdsville around 8.30 a.m and had lunch at Cordillo Downs shearing shed after stopping off at Cadelga Ruins to take photos along the way. 36 klms past the shearing shed we turned off that road and headed back up to Haddon Corner from there. whilst at the shearing shed i spoke to another fella who like us was towing a camper trailer, and he'd left Innamincka that morning (not sure what time though) and he was also having his lunch break when we arrived but left about 15 minutes after we got there, so he was slightly ahead of our timing. he also mentioned the road was in good condition the way he'd travelled, so i'm not sure what the lady at Innamincka was on about. last week we had friends come down from Haddon Corner to the Dig Tree, they mentioned the section of road past where we joined onto it from Cordillo Downs was in pretty ordinary condition, so i think the last 100 odd klms to the Dig Tree from memory, the Northern half of the road back up to Haddon Corner was in great condition when we traversed it (but this info won't effect you really as you shouldn't be on that road when going straight down to Innamincka from Cordillo Downs).
so basically the trip you asked about could be done in a big days drive, just depends what your driving, if your towing something and how fast you drive i guess. we are on the slightly quicker side when it comes to average driving speeds i'd say, but we weren't going fast on that day IMHO and were towing a trailer at the time.
the Walkers Crossing Track was also in great condition, we did it 4 days earlier then the Cordillo Downs Track, but we were driving a touch quicker then we normally would as we needed to get to Birdsville pretty quickly that day (needed phone reception for family reasons back home). that drive took us 5 hours, most people would take atleast 6 hours i'd say probably even 7 hours, just depends what speed they were doing and how many stops they made.
as with both these tracks we did stop to take photos along the way, so if your in a hurry and not towing a trailer, it can be done faster still then what we did it in, if need be.

I can't find the note book where I recorded all this from our trip last September so this is all from the map and the memory...
We did it from Innamincka to Birdsville.
Innamincka to the Arrabury turn off (just south of Cordillo Downs) is 142 km. It was a decent road where we could do about 80km/h. The next part past Cordillo Downs is 161 km. It is of a lesser grade with loose gravel, unexplained and unsignposted bends (no river or obstacle that we could see, so why the sharp right hand bend?!). It was closer to 60km/h standards.
The last bit to Birdsville (about 120km) was a decent gravel road-a bit rough but we averaged about 80km/h again from memory. Some bits were even tar (incl. the emergency air strip portion!).
So, in all...2 hours to Arrabury turn off. 2 hours to the Birdsville Dev Road. About an hour and a half to Birdsville. That's heading close to a 6 hour run.
We had a leisurely morning at Cullyamurra Waterhole and had to drop the tent and pack up our site, drive the 14km dirt track back to Innamincka to get fuel, find which damn road to follow out of Innamincka (you won't have that issue by heading south!), stopped a few times to stretch our legs and the dog's legs, and photograph ruins near the Qld border, and we were in Birdsville and had set up camp at the caravan park by 3pm.
Enjoy the trip!
:)
Wouldn't imagine roads would be that different to what we encountered...

I also have been told by the lady at Innamincka trading post that the Cordillo rd was in bad conditions and heavily trafficked by trucks, so I took the Arrabury instead and took half day to get to Birdsville. We enjoyed the trip on the gibbers but now I regret it because I wanted to visit the woolshed and take some photos. Next time I'll wait for a second opinion from an actual traveller.

Did Innamincka to Birdsville via Walkers Crossing last week.

We went through just after the little bit of rain - it was a great run. Only passed four vehicles after Moomba and we were towing which the lady at Innamincka Trading Post seemed most concerned about.

It's sandy windy tracks and then gibb - one of the best off road tracks we've done. We left Innamincka at 8 am, stopped for lunch midway along and reached Birdsville about 3.30 which was ideal.