Toilet training an adult lurcher. What worked for you?

[FiveHoursSleep]

A friend of mine has taken on an adult lurcher from the local Dog's Trust. He is a young adult, perhaps just a 'teendog' and she's had him a week but he obviously has no idea that he's supposed to be toileting outside.
She has another lurcher ( who is clean in the house), and dog sits/dog walks so there are plenty of dogs for the new boy to copy. She's taking him out every hour or so, and sometimes he'll 'go', but he'll quite often just come back inside and poo in the kitchen.
She was hoping not to have to crate him because of space issures but she's probably going to have to, isn't she?
I've only ever trained puppies as our adult rescues came to us trained. The puppy that took the longest was our lurcher, I'm not sure if the is a breed characteristic?
Could anyone who had a untrained adult dog let me know what worked for them?

I have two lurchers, and ddog1 was 6 months or so old when he came to us. Food rewards worked with him - he's very motivated for food (treats2sit4 atomic drops are a very high value reward here).

Both of mine though really hate pooing on the lead and tend to prefer to do it as part of a longer walk/run around.

But a week is really a very short amount of time considering he's been in kennels (so inside has been the right place to toilet), and she just needs to persevere with ignoring toileting in the wrong place, praising it and rewarding it in the right place, and giving him lots of opportunities to get it right

Yes, you are right, a week isn't long at all, I will remind her of this. Also a higher value food treat is a good idea, I think they are using something a bit boring.
He's such a nice boy, and is lovely and friendly with all dogs and humans, but he's a replacement for a much loved older dog who died a couple of months ago, and I suspect the toileting issues are a bit of a shock to my friend.

It is a shock - ddog2 came to us 18 months after ddog1 (ddog2 was born in rescue) and even that gap meant the horror of standing in the garden for ages and then picking up poo had been forgotten.

Rescuegirl was about 7 months when we had her, and not housetrained. Our boys were still at home then and apart from the frequent trips outside and walks, one of us would follow her every time she moved. It took a week for her to get the idea - -the poor girl was desperate to please. (She's a very happy old lady now).