> "時間{じかん}は十分{じゅうぶん}にあるので, 急{いそ}ぐことはありません。"

What is the meaning (or the grammatical role) of に in 十分に?
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particle-に
What is the meaning (or the grammatical role) of に in 十分に?
It changes 十分 into an adverb. Because 十分 is a na-adjective, when you want to
change it into an adverb, you put に after it. Note that ある is a verb, so to
describe it, you need an adverb.

You can read more about it
[here](http://www.guidetojapanese.org/learn/complete/adverbs).

EDIT: As naruto mentions, 十分 is also an adverb by itself so the に is optional.

EDIT2: However, based on the [corpus provided by The
National](http://nlb.ninjal.ac.jp/headword/AN.00024/) [Institute for Japanese
Language and Linguistics](http://nlb.ninjal.ac.jp/headword/AV.00156/) (there's
2 separate entries for 十分 based on the parsed grammatical part of speech), 十分
is used with the に a bit more frequently: 十分に＋動詞 (3686) vs 十分＋動詞
(533+1307=1840).

Note that the second number is probably higher due to some 932 entries that
weren't analyzed (未分析).

For ある specifically, it seems that there's a preference for 十分ある (227) over
十分にある (139+2).
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answer