SB 10.46.25

tāla-trayaṁ mahā-sāraṁ
 dhanur yaṣṭim ivebha-rāṭ
babhañjaikena hastena
 saptāham adadhād girim
Word for word: 
tāla-trayam — as long as three palm trees; mahā-sāram — extremely solid; dhanuḥ — the bow; yaṣṭim — a stick; iva — as; ibha-rāṭ — a royal elephant; babhañja — He broke; ekena — with one; hastena — hand; sapta-aham — for seven days; adadhāt — held; girim — a mountain.
Translation: 
With the ease of a royal elephant breaking a stick, Kṛṣṇa broke a powerful, giant bow three tālas long. He also held a mountain aloft for seven days with just one hand.
Purport: 

According to Ācārya Viśvanātha, a tāla (“palm tree”) is a measurement of about sixty hastas, or ninety feet. Thus the great bow Kṛṣṇa broke was two hundred seventy feet long.