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Lasioderma serricorne, commonly known as the cigarette beetle, cigar beetle, tobacco beetle, or drugstore beetle:

  • Live 2–4 weeks.
  • The female beetle lays as many as 100 eggs loosely on the substrate to be fed upon.
  • The larval period usually ranges from four to five months, but under very favorable conditions the development from egg to adult may occur in 6 to 8 weeks.
  • When the larvae are fully-grown, pupation occurs and they remain in this resting stage for 12 to 18 days.
  • The complete life cycle takes 26 days at 37 °C and 120 days at 20 °C.
  • In the Northeast (presumably USA, as the primary source is a USA university), there is usually only one generation per year.

Sources:
http://idl.entomology.cornell.edu/wp-content/uploads/Cigarette-and-Drugstore-Beetles.pdf
https://en.wikipedia.org/wiki/Lasioderma_serricorne

So it appears their life history cycle is:

EGG -> LARVA -> PUPATING -> ADULT
       2-5MO    12-18DAY    2-4WK

Given that the total cycle duration is much less a year, why do some regions only experience one generation per year?

Are the eggs just sitting for months on the substrate without hatching into larvae?

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    $\begingroup$ What happens when cold? Often eggs or pupae wait until warmer. $\endgroup$ Aug 26, 2021 at 8:34
  • $\begingroup$ @PolypipeWrangler Thanks for your comment. Would that mean in a climate-controlled environment they will prosper year-round? $\endgroup$ Sep 21, 2021 at 8:38
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    $\begingroup$ With other indoor pests in climate controlled house; they do live and breed constantly year round. $\endgroup$ Nov 13, 2021 at 21:24
  • $\begingroup$ @PolypipeWrangler Thank you for the update. $\endgroup$ Nov 14, 2021 at 7:22

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