Sasa trail is the most popular route up the mountain, and one can summit without the need for any technical climbing.
It is a multi-day trek to the summit, and the number of days depend on the fitness of the group and how much of the mountain you wish to explore.
Besides standing on the highest point (bragging rights!), one can explore other peaks, caves, waterfalls, the crater floor and even soak in some hot springs.
Three to five days is the norm.
One may choose to return via the same trail (Sasa), or descend via the Piswa trail. Note that this is not a loop.
The really adventurous may want to consider ascending on the Ugandan side and descending on the Kenyan side or vice versa. This can be arranged and there will be an exchange of guides near the border!
Being over four thousand meters, the usual warnings about high-altitude climbing applies.