weather, e.g. headwind or tailwind
terrain e.g. flat, uphill, downhill, hilly, rolling
type of bike
type of tyres
type of road e.g urban with lots of traffic lights & junctions or rural with no hold-ups
type of off-road e.g mud up to your armpits, or hard track
As Wafflycat asks, there are loads of factors.
Are you looking to get from a to b as quick as you can, or just a steady ride.
What bikes have you got in mind....
You'd be surprised what youre capable of. Many people think 10 miles is ...well....insane. Its not, its easiy achievable with a little effort and patience. A few rides soon build up some strength.
I went out with the wife today, she doesnt normally ride more that 2 or 3 miles. She used my old roadbike, and we did 15 miles in just over an hour.
A very steady ride for me, but quite an achievement for the wife. She was perfectly ok when she got back.....on with the day.
When I started commuting in January, the 14 mile, mostly flat ride into work took me just under an hour. I'd been going to a gym for about a year already and thought I was reasonably fit. It now takes me 47-50 minutes.(Yes, I do keep a check and I try and break my 47'17'' record once a week)
Oh, since February I've lost 16 pounds of body fat according to my gym instructor and her calipers.......
As everyone says, there are loads of variables. I did about 12 miles yesterday, took about five and a half hours, but that includes pootling, stopping to look at an old windmill, taking a lot of photos, and a pub lunch...
But if I'd had to ride 12 miles direct, I reckon, with a favourable wind (or no wind) and relatively flat, then I might manage it in an hour or so.
Main thing, if you're hoping to do it regularly, like on a commute, is to allow plenty of time to start with, so that you're not running out of time and having to flog yourself and ending up discouraged and knackered. The more you do it, the quicker you'll get.
Hi and welcome, Don't even think about buying that piece of cr@p! Seriously it will fall apart, and you don't need any kinda suspension malarky if you only intend to ride on tarmac, if you are content to buy from Halfords, then have a look at some of their 'better' Carrera own brand models, or better still find a good (local to you) and reputable LBS Local Bike Shop. Establish a rapport with the owner/manager, this relationship will stand you in good stead, trust me!