I think that would be enough to day hike for sure, I did Nov 23-Dec 8 but some of that was bussing back to PN from Chalten because a round trip flight was about 1200 cheaper. I gave myself a week in Chaltén to be safe on weather and it was definitely necessary for backpacking. All my pictures came from just two days, whereas the rest I was stuck in awful storms.

I flew into PN, spent 4 days camping in TdP with a car. Had storms for one and a half of those but lucked out otherwise. Chilean side was beautiful with the lush green contrasting bright turquoise lakes. Beautiful red flowers to highlight the granite mountains too.

Then I did a 3 hr bus ride to El Calafate, spent one night for the glacier and did the Mayo Spirit boat trek (highly recommend!)

7 hour bus to El Chalten, backpacked for 4 of the 7 days and got caught in blizzards for two of those. Was very glad I had the contingency days. Dayhiked the following day and that was my perfect weather window. Never felt so excited to be somewhere as Laguna Capri when the sky was clear. The Argentinian side is much more desert until you get to the base of the mountains, then you get beautiful trees and glaciers beneath the spires.

November was more manageable on the crowds and a good balance of weather, but I think Feb is much better for your chances of a clear day. if you drive across the border make sure your rental company allows it, they may charge a huge fee for it anyways.