Between now and the end of the season, they have the following games at Paterson's:
Port Adelaide
Fremantle
GWS
North
Gold Coast
Fremantle
Sydney
Richmond
Collingwood
Melbourne
You'd be hoping 6 wins would be a pass mark from that lot. That allows two losses to Freo, a loss to Sydney and a loss to Port, for example. That takes them to 9 potential wins.
Add in games away to Carlton, Collingwood, St Kilda, Brisbane and Adelaide where they'd be 50/50 at worst, and favourites in 4 of them and you're looking at 13 potential wins without factoring in any upsets or teams dying off (Gold Coast in Rd 23 may be done and dusted by that point for example)
They don't have to be particularly exceptional to make the finals from here, all they need to do is put away the bad teams, hold their own against the middle teams and maybe nick one result from the top teams.