Simple timespan selector
Auto-units - Timespan 1 = {{ timespan1 }} seconds
Force hours - Timespan 2 = {{ timespan2 }} seconds
Auto-units - Timespan 2 = {{ timespan2 }} seconds
Auto-units - (zero) Timespan 3 = {{ timespan3 }} seconds
Auto-units - (null) Timespan 4 = {{ timespan4 }} seconds