The best replacement for depuis is pendant.

The best alternatives to depuis are rated as following:
★★★★★  pendant
★★★  il y a
★  puisque
★  depuis que
★  des
★  ca fait

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Speaking about depuis, one probably shouldn't forget about present tense.

Other search terms related to depuis and their ratings are:
★★★★★ present tense
★★★ imparfait
★ tenses
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depuis
pendant
il y a