It is 3:00 PM on Tuesday at 135°E. What time is it at 150°E?

The time zones along 135° east longitude are Yakutsk Time (YAKT/UTC+9), Japan Standard Time (JST/UTC+9), Eastern Indonesian Time (WIT/UTC+9), Australian Central Standard Time (ACST/UTC+9:30), Vladivostok Time (VLAT/UTC+10), and in some cases Australian Central Daylight Saving Time (ACDT/UTC+10:30).
The time zones along 150° west longitude are Tahiti Time (TAHT/UTC-10) and Alaska Standard Time (AKST/UTC-9) or Alaska Daylight Saving Time (AKDT/UTC-8).
That makes the time contrasts 17, 17.5, 18, 18.5, 19, 19.5, 20, and 20.5 hours.
In this manner, the scope of conceivable answers is from 3:30 PM on Monday to 7 AM on Tuesday.

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