How long does a spider takes to form its cob web?

Question

most accurate answer would be chosen by me (:

Answer 1

Cob webs aren't made by spiders.  They are dust accumulations.

Spider webs vary by species, so it's impossible to say how long it takes unless you specify which species.

Answer 2

thousands of species

not all make webs

those that do can vary from half hour to one day

depending the specie

some live in caves and only make doors

other only hang on a thread

other make temporary little webs

others make huge webs to last for weeks

some make a web when they all combine (gossamer)

some just walk and hunt (wolf spiders ,tarantulas)

you should make a question much more specific

also it differs from climate.

or humidity

bird spiders make huge nets between trees

that take maybe several days to make

when the web is a cobweb ,it is not used by the spider any more,they are old abandoned webs full of dust