You will be very disappointed though if you really think it's a realistic goal to reach level 115 paramedic in less than a few decades =/
It's fast in the beginning but the skill compression at higher levels will make your progress slow down by much much more than you expect.
How much is your First Aid skill at now? level 6k ish? 7k levels in a skill is about twice the skill volume of 6k. Which means it will take you as long to get from 6-7k as it took you to get from 0-6k, assuming the same equipment and activity level which is of course not going to be the case but you get the idea.
Here's a list of what amount of tt skill it takes you to reach a certain level, which directly correlates to how long it takes you to reach that level.
1000 3.43ped tt
2000 11.64ped tt
3000 29.66ped tt
4000 68.62ped tt
5000 150.01ped tt
6000 311.28ped tt
7000 607.53ped tt
8000 1084.95ped tt
9000 1753.56ped tt
10000 2598.26ped tt
15000 8266.16ped tt
I checked what level paramedic you'd get if you skill naturally to level 20k (19999) which is the highest skill level supported by the skill calculator at
http://esi.coolinc.info/
Levels over 15k are only estimations so far, I've checked my highest skills and it generally takes a lot more skill than the calculator says it will. just checked a 162ped chip on auction and the calculator said it'd only take 113ped to reach the level I would get from that chip. So in reality it will probably take a lot more skill than estimated here but it's still good for you to see the insane amount of skill you'd need to max the zychion pro.
Not counting the doctor skill which there's no official information of regarding to its contribution for the paramedic profession and assuming you don't do anything but fap, you'll have the following skills at 20k First Aid.
dexterity 8k
serendipity 8k
anatomy 12k
diagnosis 10.5k
first aid 20k
medecine 9.5k
treatment 9k
medical therapy 9k
which would result in level 117 paramedic
You think 20k first aid in 3-5 years is even remotely possible? the skill calculator estimation is 13.4k tt value, which looks like a very low estimation from looking at my own high skills. Let's say it'll take 15k peds tt value of first aid skills, which is still a low estimation. Then it would take 100 times longer to reach level 117 paramedic than it takes to reach 5k first aid (assuming 100% natural skilling using the same equipment throughout, no activities other than fapping and not counting the doctor skill)
I gain about 10peds tt value of first aid skill per month (using maxed M-450) so I'm about 100 years away from maxing the zychion pro skilling naturally, unless you have a fap decay bill of thousands of peds per day I don't see how you'll reach level 115 in 5 years or less.
Play around with
http://esi.coolinc.info/
http://jdegre.net/pe/unlocker.php
yourself and you'll get a far from perfect but much better estimation than you can do yourself in your head.