No 'probably' about it I would be obviously pissed.
The multiple pints during work thing is amazing to me also, plus the financial aspect as Billy says. How much do you pay for a pint?
That was one thing for me that I had to cut out. Drinking at lunchtime is a vicious circle. When my marriage was at it's worst, I had a period of about 2 years where I would go the pub maybe 3 days a week and have 2 or 3 pints because I dreaded the evenings and a few pints with the paper at lunch was a release. The problem with that is that drinking at lunchtime and then stopping makes you tired in the afternoon so you get to the time you finish and you have 2 choices i) don't have another drink and feel sluggish and lethargic all night or ii) have a few more beers and the choice is always the latter unfortunately.
I do very rarely have one at lunch now but that is more a social thing if people from work are going out but that is probably twice a year.
The cost was a big thing for me too. I work in London and the pub I was drinking in was a fiver a pint and I was getting a little bit of lunch in there so I was spending 20 quid per lunch break and you look back at the end of the month and realise you have pissed a fortune up the wall.
From your other posts Barney, sounds like you have a lot of other stuff on in your life so I can see the need for the release and I don't blame you. I don't know what job you do and what hours you work but mine is an office job and I found any of these 3 helped:
1) bring lunch in with you, that way you don't leave the office and the temptation for the pub is lessened
2) leave your bank cards at home and only take to work with you the money you will need for the day. I used to bring a fiver in as that would cover anything I needed and wasn't enough to go the pub
3) go lunch early. I found that if I did leave the office, going at my first opportunity (12) meant that I could go out and be back in the office before I really felt like a beer. If I left it until 1 or later I knew i'd be tempted.