Question about Optuna arguments


I’m trying to do hyperparameter tuning with Optuna for my Breakout agent. This is the simple example given in the doc :

python --algo ppo --env MountainCar-v0 -n 50000 -optimize --n-trials 1000 --n-jobs 2 \
  --sampler tpe --pruner median

Should I change the number of timesteps ? According to what ? And what about n-jobs ?

Best regards and thanks in advance for the help,