This is the right choice for you if you have no time but you really wanna do mount Rinjani Trekking. You will pass through the same trek with 2 days via senaru but with a shorter time.
2 days via senaru
The trek is not too hard, you will walk through the rainforest jungle from senaru starting point to pos 3. and after that, you will climb a slightly steep hill from post 3 to the camping area
3 days via senaru
Hiking mount rinjani for 3 days 2 nights start from senaru and ends in torean (new viral route). You will spend the night at Pelawangan Senaru and on the shores of Lake Segara Anak
2 days via sembalun
starts from sembalun village to the camping area (pelawangan sembalun) on the first day (pass through the savanna) and continue to the summit on the second days at 03 Am
3 days via sembalun
starting from Sembalun to the crater rim Sembalun,summit, Lake and swim at hot spring then climb to crater Senaru rim and overnight in tent then last day trek down to Senaru village.
4 days via sembalun
the route taken is the same as 3 days from Sembalun. but with additional time, you will spend the night at the Sembalun crater rim, the edge of the Segara Anak lake and the Senaru crater