IMO from experience, but im no expert lol, you fill the tank with your water and tap water conditioner, then wait 24 hours and add your TSS and fish....wait 7-10 days and see how the cycle went ...
some factors that seem to make a difference...
pH- if ph is below 6.8 , it does take longer as its ammonium not
ammonia under that ph..ammonium does seem to starve the bacteria in the TSS to some extent where it goes past the 10 days...some members have had to do small water changes for a week or so after the 10 days....
using the conditioner for tap water then waiting the 24 hours is a must as some conditioners detox the ammonia and stall when mixing it with tss....
make sure the shelf life isnt over 6 months old of the bottle
no extreme heat or cold that the bottle has been exposed to
good luck and hope you can find some!