56,700.
15 miles following M61 MANCHESTER.
92 miles, 2 hours by car (Snake Pass, M60/M61).
280 miles taking this route:Take M1 (NORTH) from Sheffield to M62 to MANCHESTER at J42. Follow signs to M62 (W) to MANCHESTER.Take M62 (W) to M60 RING ROAD (W) (to M61). Continue on M60 on the RING ROAD (around Manchester) to M61 (to M6 NORTH) to PRESTON.Take M61 to M6 (NORTH) to PRESTON.Take M6 to SCOTLAND, where M6 becomes A74(M).Continue on A74(M) & M74 to Glasgow.
6000 rounds per minute for the M61A1 6600 rounds per minute for the M61A2
35 miles via M65 (WEST), M61 (SOUTH) and M60 (EAST).
In 1946, the Army issued General Electric a contract for "Project Vulcan", a six-barrel weapon capable of firing 7,200 rounds per minute (rpm) The M61 and other powered gatling guns grew out of this contract. It was quite likely a reference to Vulcan, the mythical smith who forged weapons for the gods.
210 miles taking this route:Take M4 SOUTH WALES, from Reading, to A34 to NEWBURY and OXFORD at J13; follow signs off the exit ramp to A34 OXFORD.Take A34 to M40 to The MIDLANDS to BANBURY.Take M40 to M42 (N).Take M42 (N) to M6 TOLL to The NORTH WEST.Take M6 TOLL, around BIRMINGHAM, to M6 (NORTH).Take M6 to M62 to BOLTON at J21A.Take M62 to M60 RING ROAD (E) towards M61.Take M60 RING ROAD (E) to M61 to BOLTON at J15.Take M61 to Bolton.
40 miles taking this route:Take M61 PRESTON, from Bolton, to M6 towards PRESTON and LANCASTER.Take M6 to Lancaster.
85 miles taking this route:Take A53 NEWCASTLE, from Shrewsbury, to M6; follow signs to M6 to The NORTH WEST to MANCHESTER.Take M6 to The NORTH WEST to M62 to BOLTON at J21A.Take M62 to M61 to BOLTON via M60 RING ROAD (N) around MANCHESTER.Take M61 to A666 BOLTON at J2.Take A666 to Bolton.
242 miles taking this route:Take M62 (W) towards MANCHESTER from Halifax to M61 (to M6 NORTH) TO PRESTON and BOLTON via M60 RING ROAD (W) around Manchester.Take M61 to M6 (N) to PRESTON.Take M6 to the NORTH to SCOTLAND, where you will exit off the FIRST EXIT in Scotland onto A75 SOUTH WEST SCOTLAND to DUMFRIES and STRANRAER.Take A75 to Stranraer.
If you mean the 20mm M61 Vulcan Gatling Gun, some versions can fire at a rate of 6,000 rounds per minute- but for fairly short periods of time.