Suhagra 25 mg generally starts to work within 30 minutes to 1 hour after ingestion. The onset time can vary based on individual factors such as metabolism and food intake. It is important to note that sexual stimulation is necessary for the medication to produce its effects. The effects of Suhagra 25 mg typically last for about 4 to 5 hours. During this time, you may find it easier to achieve and maintain an erection suitable for sexual activity.