It depends on what year your vehicle is and the type of coolant it requires. Sounds like you have an older Civic that uses the older green coolant (inorganic acid technology). Green coolant needs to be changed every 30 k miles or two years because the additives break down and corrosion can result.
If you have a newer Civic you should be using Honda Blue long life coolant or an equivalent. I believe that coolant is an Oragnic acid technology formula in which the additives last much longer and the coolant is easier on water pumps seals. The older green style used silicates which can be abrasive to engine internals/seals/etc.
The blue Honda coolant can last up to 100,000 miles on original fill...I believe it's 50,000 miles on the exchange.
A lifetime ago there was only "green" coolant, you can thank Ford for changing all that. Years ago they discovered that their fleet vehicles in Europe were having a hard time handling the tap water over there because it was high in minerals, salts, metals, etc. They developed these formulas that were less abrasive to the cooling system....I will say that on all the fords I've worked on over the years, their cooling systems are pretty trouble free compared to other companies (at least they were 10-12 years ago, don't know how they are now).
There are other formulas out there...HOAT hybrid organic acid technology (in fact Honda blue may be that, I'm not sure). Be either way most newer factory coolants are long life coolants. You can convert your civic to the Blue formula, but you have to make certain that you remove ALL of the OLD STUFF. ALL OF IT. If not the coolants will mix and neither additive package will do what it's supposed to do, I've also seen IAT coolant turn into a gell like substance when mixed with OAT coolant and clog radiators and heater cores.