In article , says...

On 2/6/2020 1:36 PM, Thomas wrote:
98mm is under 4 inches. What do you consider short?

Depends on size, thinner are shorter. You can find a few 18" ones here
https://www.mcmaster.com/extra-long-drill-bits




Just getting into this, at work we had some 1/8 inch bits and a few
other sizes up to about 1/2 inch that were about a foot long, some 1/4
and 5/16 inch bits that were about 5 feet long.