Tsipras scheduled to officially get his exploratory mandate at 2PM tomorrow. Odds he'll make it to Wednesday before giving up?
(This definitely overcomplicates things, but I'm in an overcomplicating mood.)
No party has agreed to work with ND (except PASOK, but all they referred to is a "government of national unity"). Two parties have not definitively rejected cooperation with SYRIZA: PASOK and DIMAR. Let's say they cooperate and get 112 seats.
SYRIZA will still need cooperation from right-wing ANEL and Stalinist KKE. That will not happen. But SYRIZA can take the whole three days, and by the end blame those two parties for not cooperating. All this is to suck votes from KKE and ANEL sympathizers in the following election so they edge over ND.
I would say SYRIZA is most eager for an election right now. They can gain votes from new KKE voters who realizes that their votes can make more of a difference with SYRIZA, as well as votes from all those parties not in parliament. There's around 8-9% of votes for anti-austerity parties who did not get into parliament ripe for the picking.