The Mardi Himal Trek is relatively short but incredibly scenic in the Annapurna region of Nepal. It offers stunning views of the Annapurna and Dhaulagiri mountain ranges, as well as an opportunity to experience local culture and hospitality. While the standard duration for the Mardi Himal Trek is usually around 5-7 days, a 5-day itinerary would be quite tight and physically demanding, as the trek involves ascending to higher altitudes. Here's a rough outline of a 5-day 

Please note that this itinerary is quite ambitious for a 5-day trek, especially considering the altitude gain. Altitude sickness can be a serious concern, and it's important to acclimatize properly to minimize the risks. 

It's recommended to have some prior trekking experience and a good level of fitness if you're planning to complete the Mardi Himal Trek in 5 days.

Always check the latest information, trail conditions, and weather forecasts before embarking on any trek. It's also a good idea to go with a reputable trekking agency and hire an experienced guide to ensure your safety and make the most of your trekking experience.