As chronicled in your researcher's journal as I researched my history of early lifestyles in South Asia...
I get frustrated at how long certain sites take -- not at all frustrated if they're full
of fascinating information, but if at the end of it all I find it's
basically "The people at this site had dishes. The End." But the process
will speed up eventually because though I start researching a site when
it comes up chronologically in my old notes,
I at that point do the research for its whole history, at least up to
when I plan to stop my book (700 CE).
Current time travel apparatus location: Vancouver, Canada