A dab of bupivacaine will last for about an hour. Bupivacaine is an anesthetic drug mainly used for keratoscopy, removal and suturing of corneal foreign bodies, IOP determination or for epidural block, subarachnoid space block, nerve conduction block and mucosal surface anesthesia. The effect starts 5-10 minutes after administration and the pain will be significantly reduced or painless when doing the procedure. The effect is maintained for about an hour, so the procedure usually takes less than an hour. The pain around the wound will increase after surgery, during this period you can take oral pain medication as prescribed by the doctor, and you need to rest in bed, usually the pain lasts for 24 hours, after 24 hours the pain will gradually decrease. In addition, it is necessary to change the medication once a day to observe the recovery of the wound and to take oral anti-inflammatory drugs to prevent wound infection. As mentioned above, bupivacaine has a shorter maintenance time, and if necessary, lidocaine gel can also be used for better results and longer maintenance time. In addition, it should be noted that bupivacaine is a prescription drug and needs to be prescribed at the discretion of the doctor after taking into account the patient’s condition.