18 months is weird
It’s neither party wanting to commit
Then On the other hand, maybe it’s not that weird
18 months is a decent amount of time to implement a new mentality/system and to show “progress”.
Break the mould, bring a winning mentality in, get the players hungry, stop the rot and maybe some funds on top during this period in January and the Summer to aid the change.
You won’t get the finished article in 18 months of course, but you can certainly turn things around extremely positively in that time, Spurs need that, desperately