Both are fine but there is definitely a difference in nuance.
"I don't want to take up any more of your time"
almost suggests that there is still more important information you would like to relay.
"I don't want to waste any more of your time"
almost suggests that what you have left to say is just more adjunct information that is not necessarily important.
hope this helped :)
24 november 2014
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Yes, both are fine.
24 november 2014
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Heb je je antwoorden nog steeds niet gevonden?
Schrijf je vragen op en laat de moedertaalsprekers je helpen!