I'd say circa 60 hours on average.
As with PompeyPaul, I was on the money too. Did my first hour in Nov and Skills Test in May of the following year. Solo in 9h45 - end Jan (still waiting for my medical until then!) Biggest gap between lessons was 4 weeks (weather at end Nov/early Dec was pathetic, caused much frustration! Then 3 wks in Feb, wx again!) Managed to get a week's worth in during the April where I racked up 18h40! QXC @ 27h15. I booked to fly once a week, sometimes got the odd extra hour in but couldn't do Sat and Sun due to instructor unavailable; they need time off too!
Total cost in the region of £6k (fuel was slightly cheaper then!) which included most of the hours on C152, some on PA28-161, exam fees, nav eqpt (charts etc), license issue, medical AND club membership (landing fees, circuits included). Not sure of their costs right now but I can highly recommend the school I used. CFI & DCFI both top blokes but that might be no help to you considering your relative location!
Top tips;
1. Be prepared to get weathered off or not to have access to serviceable aircraft; even with 4 or 5 available to me during the time I learnt, there was the odd occasion where there was nothing as school a/c have a tendency to go tech rather often (not surprising the amount they get bashed around by students!)
2. Stick with it, sometimes you'll get frustrated. It isn't the instructor's fault if the wx is pants! Use this time wisely to get the theory under your belt. Get your R/T practical done as early as you can or you'll be waiting around for an R/T examiner after you've passed your Skills Test and can't get your license issued until you've passed this one.
3. If you can fit 4 flights a week in during the Summer, I'll take my hat off to you. Not only are you going to be competing with others for aircraft availability (it isn't just student pilots who want the aircraft), you need to consider instructor availability too (perhaps they might want to take Summer holidays?) Furthermore, the school won't want to rush you too much; they know they've got a steady income stream out of you over an average period; they need to protect their interests. Final point on this one is that believe it or not, learning to fly is both mentally and physically hard work. Don't underestimate how tired you'll be after more than 60-90 mins in the saddle, especially when you roll the Nav into the mix!
4. Enjoy it - at the end of this you will be a qualified pilot (then the learning really begins)! Don't let any of the above put you off, just trying to put things into perspective for you.
Best of luck, whichever route you choose (check NOTAMS first though)
Stood by for flames......