The question is not silly
all real world electrical circuits
have some
resistance
capacitance
inductance
if the ignition wires used
have appreciable
capacitance and/or inductance
then this will delay in time
the build up of
"flashover voltage"
at the spark gap
the delay is not due to a change in the speed of light
but because of the time to build up
stored energy in capacitive or inductive fields
typical carbon core factory ignition wires
will not have much capacitance or inductance
.. but can have enough capacitance to cause
"crossfire"
to a nearby wire from another cylinder's
if they run close and parallel
Chrysler has had problems with this:
http://dodgeram.info/tsb/1998/18-48-98.htmspiral wound metal core
low RFI design ignition wires
will have more measured inductance
but the design is an inherently bad
"antenna"
for high frequency AC
aircraft gasoline engine ignition wires
can be fully covered by a shield
for RFI reasons
and might measurably slow down
the speed at which flashover voltage builds up
but this is understood and compensated for
as an extreme experiment
if you took an
extra long solid metal core ignition wire
and wrapped it numerous times
around an iron bar midway
before connecting it to the sparkplug
the delay would be as great as practical
and spark burn time would be extended somewhat
as the inductive fields discharged as the current declined
