A logo is a visual representation of a company; it is more like creating one perfect visual mark for your business. Depending on the types it can have, just a symbol, a brand mark, a logotype or say a tagline. A logo offers different purposes the one main purpose is that it is designed to communicate with your audience in a unique way.

The logo needs to be simple which means one can identify it at a glance. It has to be memorable so that it can stay with your audience, it should be unique, as one of its kind and it has to be versatile which means one can use it in various shapes and sizes and it has to be appropriate about your brand or service you are providing.

Designing a logo is not a piece of cake and it requires research, effort, skills, and abilities. All of such is implemented in the logo design process to make it a success. While every designer has its way of dealing with things it is safe to say that logo designing takes about a few hours including all the designing processes etc.

Well the answer to this question can be a little controversial as every logo designer decides this on their own but the average one should present only one variant. And let them decide if its fits their business or not and if it fits only then you can work on the new one. Because for you to develop that single variant you have to go through a lot of intermediate options.