Don't output diagnostics when simulation is less than 1h

[Sbozzolo]

There's no point in adding hourly diagnostics when the simulation is less than 1h

[juliasloan25]

Looks good, just one thought - this function taking in only t_end implies that t_start = 0. Maybe it should take in the simulation length instead

[Sbozzolo]

Looks good, just one thought - this function taking in only t_end implies that t_start = 0. Maybe it should take in the simulation length instead

Changed to use duration instead.