The T2 from Todmorden Bus Station to Longfield has a direct journey time of 4 minutes, although most daytime journeys now go via the railway station in one direction or the other, adding 2 minutes to that leg.
Most of the other really short routes in the area have been incorporated into longer routes: the former H4 from Hebden Bridge centre to Fairfield was 4 minutes each way, and is now combined as the 598 with the former H5 Eaves route which was a (very tight!) 5 minutes. The former H3 to Dodd Naze was also given 5 minutes, and is now part of the 595 - with only 3 minutes given to its former terminus I see.
Todmorden also had a stand-alone daytime T5 from the Bus Stn to Carr House and direct return, which got 5 minutes each way. It is now covered by the T3 and T4, I suspect it changed in the early 1990s after my first spell of minibus driving at Todmorden had ended. And of course the 'trunk' T1 to Cross Lee is only 7 minutes up and 8 back.