How long will a pinched nerve take to calm down?

6 weeks: Nerves recover relatively slowly compared to other body tissues from effects of compression. Recovery depends upon duration of compression, severity of compression, location of compression (such as a bony prominence), the particular nerve and person's age & comorbidities. As a general rule 6 weeks may be the earliest in moderate cases.

Variable: The reason that cause the pinching should be corrected. If it is posture or need for an manual adjustment might be rapid. If is such to require surgery, the time is much longer.

Depends on the cause: A pinched nerve causes symptoms of numbness, tingling and sometimes burning. When out hand or foot "falls asleep", that is a pinched nerve. It recovers in minutes. When a nerve is injured, such as a nerve in the neck, it may not recover for days, weeks, or months, depending on whether the cause is corrected.