I'm on reserve. I've been asked "how soon can you get there?" I usually banter a little but without arguing. I know of 2 times in MIA my friends said 4 hours. They got tagged with missed trip or missed assignment. They had to go into the office. One walked in with a holiday tie on. OMG big mistake. The 2 chiefs hammered him on the 3 occasions that you can wear a holiday tie.
That is the kind of crud that goes on here. Really bad Boy Scout leaders.
But technically reasonably available by surface transportation is what the bid package says if bidding reserve. Most of the time it is for next day flying. Not short call.
I was called last Monday on my day off. I answered the phone just for grins as I was on Golden days off. She realized after I said Hello whats up? She siad you're on a day off. I said Yes. She said I gotta go cover a trip bye.
She didn;t even ask me. Kind of weird and funny. There is no way I would have gone in.
Beginning Jan 1, 2013 reserves can fly on there day off for pay above guarantee of 73 hrs. To my knowledge NO-ONE in MIA has been offered this.
If it ever happens you'd have to be really senior reserve to get it.
Hope this info helps. On reserve you never know what they will ask you. Never commit to a time. I do not know what traffic is, I'll get there as soon as possible, is the trip on my schedule? Can I have up front parking voucher?