"various durations" is correct and usable in written English.
You could use this phrase to describe various lengths of time. For example: "We have various durations of stay available, from one week to one month."
Tours of various durations and locations.
Side and region dependent changes in dopamine activation with various durations of restraint stress.
The experimental design also comprised breaks with various durations.
The stirring was carried out in various durations.
Yow, H. N. & Routh, A. F. Release profiles of encapsulated actives from colloidosomes sintered for various durations.
We attempted to optimize the protocol for rhesus cells by comparing various durations of CHIR and IWP2 treatments.
Projects can be of various durations as long as they do not exceed four months.
Sustaining production, maintenance, repair, logistics, and other activities in support of military operations of various durations and intensity.
The tests were performed for various durations in order to study the disc damage evolution.
From these data, the rainfall depths for various durations were computed, i.e. 1 to 7 days.
Nine different anodic-cathodic pulse couples with various durations were selected for processing.
