Most importantly about the how the director & actor are in sync with each other. SLB has his own pace & he is someone who demands complete freedom. Infact that is how he has worked all his career even with Salman Khan. Infact after Sooraj Barjatya (except PRDP), it is SLB with whom Salman Khan surrendered entirely as an actor, stripping his superstar image.
And even in HDDCS, Salman Khan wanted a different ending where Aishwarya will choose the lover over husband but SLB put his foot down. Salman wanted to make a stand but SLB chose Indian culture & sensibilities. Salman obliged. Be it Srk or Big B or Ranbir or Hrithik or Ranveer, basically all have completely surrendered themselves to SLB the director/filmmaker.
So, I don't see Salman Khan pushing SLB to complete the film on a deadline i.e. EID. Eventually Salman will give SLB the space he needs. And we all know Salman has excelled with his performances when he has surrendered to the director (sole exception of Dabangg & Wanted films.)