Hopefully that's all the time, because you do not want to fill the case so full that seating the bullet compacts the powder. Then you do get a *boom* when you pull the trigger.
Actually my best .06 load is slightly compressed when the 165 gr bullet is seated.
“you do not want to fill the case so full that seating the bullet compacts the powder”
Study a few reloading manuals and you are bound to discover that *some* powders can be very lightly compressed. Loading density is one the factors that I consider when selecting a powder.
You shouldn’t have any problems from a slightly compressed load.
There are many professionally developed loads that are compressed.
What you really don’t want in a smokeless load is that the load density is so reduced that you can get ignition across the top of the powder for the length of the case. Pressures can go up markedly in that instance.
All reloading manuals list loads which are assembled with the bullet compressing the powder as the bullet is seated in the case.
Shotgun shells often have detailed powder pressure data, so that the over powder wad (and sometimes the other wads) applies the correct amount of pressure to the powder.