Karin – I agree with Ruby. It can be hard to give you an accurate opinion on the amount of work involved without knowing the specifics, and having some understanding of the details of how you're set up. Drupal is a pretty open-ended framework and there are often multiple ways to do things. For example there are often times where someone will have set up some functionality in a way that doesn't make a lot of sense (simply due to not being very familiar with Drupal), which can make changing it later a royal pain.
So what that means is that to get another estimate, really you would have to get someone technical to scope out the work. At a minimum you would need to provide the names of the specific modules involved, and a specific scope of work for the changes you want, including the specifics of the branding that you would be expecting to see.
In your case, from what I can gather in your description –
Updating 2 existing modules should be trivial (15 mins say), if they are existing modules on drupal.org that just need a newer version installed. Or, if you mean "update" as in these are custom modules that require new code to be added, that could take almost any amount of time depending on the code changes themselves.
Applying branding to a page depends on how extensive the branding itself is and how different from the current design on that page. Also depends on how much flexibility you have ("it should look something like this" versus "it needs to look exactly like this design mockup"). It's substantially different to change a logo and the colour scheme, versus implementing an entire page design. It also depends on whether the page is responsive (mobile friendly) or not. However one specific thing I can tell you is that it's not likely to matter how many pages are involved (if the overall page design is the same for each one).
Sorry if this isn't the answer you were looking for. :)
Martin Hansen Team Lead, Web Services 519.725.7875 x2120 | 888.817.3048
PeaceWorks™ Technology Solutions 101 - 554 Parkside Drive, Waterloo ON N2L 5Z4 www.peaceworks.ca
Mission driven technology solutions
This communication is intended for only the party to whom it is addressed and may contain information that is privileged or confidential. Any other distribution, copying or disclosure is strictly prohibited and is not a waiver of privilege or confidentiality. If you have received this telecommunication in error, please notify the sender immediately by return email and delete this message from your computer.
Please note: If you do not wish to receive promotional emails from us, please reply to this message indicating your preference and we will refrain from sending further promotional emails.