The most that a player can be fined is his prorated signing bonus for the year he is holding out.
In Kam's case, that is $1M.
The fines start at $30k/day of training cap... +15% of signing bonus on the 6th day of holdout... +1%/day (max 25%)... +25% for 1st regular season game missed... and after 4 weeks, 1/17 of his of his salary for each game missed.
So he he stays out all of training camp, his fine totals $250k.
If he also misses the week 1 game, his fine increases to $500k.
If his holdout continues for weeks 2 through 4, his fine increases to $767.6k.
And if he holds out through game #5, his fine maxes out at $1M.