I mostly had the app open since it started and ended up using 2 Incenses and Shiny checking everything I could (except when i needed to send some Pokémon over to Home to free up some space in Go... and when i needed to reconnect my laptop online)
Considering im stuck inside because of quarantine and other reasons im kind of surprised i was able to get that many myself
But, i guess it was just god luck for me in the end, I suppose