Hey there, welcome to the group!
I think from they way you describe your smoking habits, if you get the right setup and juice it shouldn't take too long but never rush it
It honestly depends completely on the person their habit and willpower but i stopped in about 5-7 months.
I tried the little cig-a-likes like the blu brand but they only worked for a few weeks and I HAD to find something with a little more punch in terms of vapor and throat hit.
I was watching a guy streaming some game online and saw him smoking what looked like a bigger version of a small ecig. I asked him about all the parts and he gave me a list. I went to myvaporstore.com
and bought a vision spinner, a cleromizer tank, and a USB charger and some juice from mtbakervapor.com
This is basically what I ended up with http://www.myvaporstore.com/Vision_Spinn.../vvs-c.htm
I have to say that the vision spinner or any batter with the adjustable voltage blew any cheap cig-a-like out of the water.
This set up will let you adjust how much vapor and throat hit you want based on your needs at any given time.
Now for the other important thing to consider, the juice blend and flavor.
Buy juice that mimics your smoking habit and cig type. For example I was a two pack a day full flavor menthol smoker.
Because of that I went with a higher PG juice such as 70%PG/30%VG and 12 mg nicotine. The reason for this is that PG give more throat hit and with the12mg nicotine I got the "Fix" I needed and it really felt like I was actually smoking with that nice throat hit.
For you I might recommend 50/50 PG VG with maybe 18 or 12% nicotine for at least the first couple months.
If you smoke menthol like I did pick up some Extreme Ice Juice
and vape just that or try 555 Menthol E Juice Baker Vapor
. I liked a lot of menthol so I went with the Extreme Ice.
As far as quitting smoking completely, try doing what I did and take it slow. Cut your smoking in half per day and make sure to use your ecig during times when you would normally HAVE to have a real cig like in the morning or after dinner, then smoke the real cigs any other times to help break your ritualistic smoking.
Once you are used to that it will get easier to ween your self of smoking throughout the rest of the day.
I eventually just forgot to light up since I had my vape right there.
If you want to get off nicotine completely, I just got a big clean glass bottle and would slowly dilute my old higher nic juice with new lower nic juice and eventually I wasn't missing nicotine at all. I do however use a little light nic juice in the morning with my coffee but I never fiend for the stuff anymore.
Sorry for the wall of text but I could talk for hours about making the switch lol.