French to English Bus/Financial General / Conversation / Greetings / Letters photo publishing

Yes, I know, 'in the olden days' etc., etc... (by the way does anyone know where the neiges d'antan are and whether Francois Villon ever found them?).

Snows of yesteryear aside, I am slightly perplexed by the use of this expression in my current document, which is a contract between a publisher and a photographer they are commissioning.

And before anyone gives me a 'check the glossaries bashing' - yes, I have checked them, but they have confirmed the ambiguity as far as I see it.

My problem is this: I am not sure from the clause whether 'dans le temps' means 'over time' as it sometimes does, or whether it is talking about timescales and deadlines (a possibility also suggested by one of the glossary entries)... either are possible in the context. Of course, I may have to ask the client unless anyone can convince me of the most likely answer. 'Incidences' I have translated as 'repercussions' (I would have thought that the idea of 'over time' was inherent in this term)...or I suppose it could be 'impact' (still deliberating on that one)...

En cas de modification des caractéristiques de l’œuvre et/ou de la contribution, la décision de modification fera l’objet d’un avenant ou d’un échange de lettres qui confirmera le nouvel accord des parties, et en précisera les conditions et incidences notamment financières et ***dans le temps***.

Thanks in advance for any helpful suggestions.