I seem to recall the Essendon/ISC deal was quite substantial and the figure was publicised.definitely the longest, nobody knows what the other bigger clubs are on though
EDIT:
https://www.bigfooty.com/forum/threads/essendon-signing-with-isc.1127755/its been confirmed by Herald Sun and Fox Footy, that Essendon have signed a 7 year deal with ISC to be the apparel sponsor once the current adidas deal ends. Its been said the deal is going to be worth 7 million dollars.
Will be interesting to see if ISC change anything with the guernseys?
news link
http://www.heraldsun.com.au/sport/a...n/news-story/a09fc63fa6935dc352eb8cb441165634