Extract number of frames from simulation time

GROMACS version:2019.2
GROMACS modification: Yes/No
My simulation has 10000000 steps and dt=0.01 ps. How to find total number of frames and simulation time is 100ns?

the number of frames you have in the output file (e.i trajectory) depends on the frequency you use to save them . The values is defined in mdp file -Molecular dynamics parameters (.mdp options) — GROMACS 2022.2 documentation

The simulation time is given by the (number of step)*(time-step) the value is in ps.