IMO it depends what you do with your hands..
I used to wear false nails alot, usually when going out, i then bought white tips and stuck them on, and was then bought a 'quick dip acrylic kit' which was okay, but would only last a week..
ive had them done once at a proper shop and if i remember rightly they lasted 3 weeks..
My cousin was training, and she did them for me for £10, they was okay, a big bobbly and one nail wasnt straight, i think they lasted a week or 2..
then when she opened her own nail salon, i have been there once too, again they werent prefect, i duna if she didnt do as well cos she didnt charge me full price, or if shes still not that good.. they were a bobbly still, wasnt filed down right on the ends and started to lift at my nail bed quite quickly, overall they lasted about 2-3 week...
I have excema, and used to scratch alot, so nails never lasted me 2 mins, i also had a cleaning job, so again due to water and chemicals they wouldnt last..
I now work in a office and would love to have nice nails all the time, i just cant afford to pay for them.. where i live (leeds UK) you can pay anything from £20-£40 for a full set of acrylics, some salons have deals though and you can pay £10-£15