How many days after his leg was squeezed during the lockdown was it that Locke no longer need his crutches again?

Can't recall, but Jack told him it would take a few weeks. And there was the subsequent scene with Rose on the beach where she pointedly said (paraphrase) "but you and I both know it won't be that long, don't we?"

"Dave" took place the day after "Lockdown" because of the pallet drop discovery. According to the timeline at Lostpedia, "S.O.S." started on the same day "Dave" took place, and the rest of the episode took place one day later. The large bulk of "Two for the Road" is set a day after the events from "S.O.S.", and if we take the weird day/night discrepancies between "Two for the Road" and "?" into consideration, "?" happened the day after "Two for the Road". Now, according to Lostpedia again, the present-day action of "Three Minutes" happened on the same day as "?", and Libby's funeral leads right into the beginning of "Live Together, Die Alone". The first half of the season finale takes place the day afterwards, and the second part the day after that. So it was just six days (!) after the lockdown event that Locke threw away his crutches, and after the hatch implosion he was "missing for a whole day" before he woke up in the jungle in "Further Instructions", and went off to fight a polar bear the same day.