Sounds quite honest - I like that
Many people forget that coaching a top team is not a bed of roses, even when we are as successful as now.
Our match schedule speaks for itself this season - it really has been intense, and it is quite an achievement to keep the team going.
On top of that managing is more than putting MSN in the starting 11 - he has to keep everybody happy, and still convince them to follow his little changes in tactics before every game.
I imagine it is like Messi said about winning and competing all the time - they just stay focused and wait 'till it is over to look back (he meant retirement, for Lucho that might be when his Barca-spell ends). Sounds like he could be tempted to take a year off when he is done in Barca a couple of trebles from now
Shorter contracts is of course also a way to put pressure on the board, and secure more power: Do as I demand, or I'll find another challenge. This is getting increasingly important, I would imagine, and might be top priority for coaches nowadays with owners or boards overruling them in transfer-situations, summer-preparations, commercial tours etc..