2 sentences

1. 他沉默良久，终于开口了。

   tā chén​mò liáng​jiǔ, zhōng​yú kāi​kǒu le.

   He was silent for a long time before he finally spoke.

   Source: Dong Chinese Dictionary

2. 双方激战良久，始终胜负难决。

   shuāng​fāng jī​zhàn liáng​jiǔ, shǐ​zhōng shèng​fù nán jué.

   The two sides fought fiercely for a long time, but the outcome remained undecided.

   Source: Dong Chinese Dictionary