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Why do I have about 2hrs:30minutes Simulation time? Is there something I can do to improve this time? Or is it dependant on your end?

Have you asked for a long simulation time (Ts) with a timestep of Ts/10k or smaller?

That extends the actual simulation time.

Or is your circuit oscillating?

Or is it struggling to find the initial conditions?

Publicise your circuit then we can have a look and may be able to offer some more helpful advice.

:)

What I usually do is choose a short simulation time, like 3 cycles of the lowest frequency I expect to see, then choose a time step of 1/100 to 1/1000 of that.

That usually gives adequate results for a first look-see.

Sorry for the long response been busy with other work. But Its a simple RC Filter: https://www.circuitlab.com/circuit/44m6hv/filter/, I was doing a time sweep simulation varying the frequency. With the stop time 5 seconds and a step of about 0.001, then the frequency was 1 to 10000 decade with a step of 100 per decade. I tried it in safari and chrome on my macbook pro.

Looks like the forum picked up the comma trailing your URL as part of the URL. In any case, when I open your simple RC highpass circuit:

and run a time domain simulation for stop time "10m", time step "10u", it completes in 0.44 seconds. When I do a frequency domain simulation, 1 to 1e8 Hz, 100 pts/decade, it completes in 0.28 seconds. Both numbers are on my laptop / Chrome / Linux.

Using a simulation timestep of 0.001 (1 millisecond) with a 1kHz function generator would be inadvisable -- the simulator will be sampling the function at its fundamental period.