The number of winds required depends on the type of movement & condition of its mainspring. Generally, you wind it, gently, until it stops (do not force it).
In most cases, when the chrono hands do not reset at their correct null positions, it is because the joint that fixes the hand wand to its post is loose (a common problem with rep hands). You have 3 options - replace the hands (& keep your fingers crossed that the next set will be better - 50/50 chance), have a watchmaker tighten the joint or epoxy it (there are many threads detailing the process that you can search out)
(Original pic courtesy of Avitt)