IOTL Falklands it took the Brits a month to get their TF to the TEZ, 7 weeks to get the landing done and another 3 weeks to advance to victory. This took them well into the southern hemisphere winter, they would soon have had to stop fighting on account of the weather.
So WI, instead of bringing forward Op. Rosario forward and forcing it to happen within a fortnight of the Sth Georgia scrap metal incident the Junta decided that they would make the invasion happen on Argentina's national day, 25th May? Would 2 months of hurried activity be enough to get a few more exocets and other stuff? Could Britain maintain political enthusiasm for the war until the southern spring, some 6 months away? Would the extra time enable the Arg forces to come up with a good defence plan? How much more powerful would the Brit forces be with 6 months to prepare?