EasyPrompt, here's my version of the timeline for what it's worth. Two witnesses will start their public ministry after the 6th trumpet blast according to Revelation chronology. Their ministry would last 3 1/2 years, ending with the onset of the 5th plague. The first resurrection would then take place in the days of the 7th trumpet. Half of the tribulation: 3 1/2 years. The second resurrection would start after Armageddon (cf. Dan. 12:13).
1) Sum total: Great Tribulation + Battle of Armageddon: 1,290 days + 1,335 days = 2,625 days
Day of the LORD: 2,625 days - 2,520 days = 105 days or 3½ months. The full duration of the LORD’s Day is therefore 105 days or 3½ months (from the end of the Tribulation to Armageddon). Only after 2,625 days had run their course, would the surviving observers be declared happy (Dan. 12:11-13; cf. Rev. 7:9, 14). The last chapter of Daniel and the activities of the King of the North here should be seen within the context of the Great Tribulation (Dan. 11:40-12:1, 4, 7, 10).
2) 360 days + 1,260 days + 105 days = 1,725 days
Evening-morning: 1) The two nouns are singular. 2) Lit. an “evening-morning” time unit (not time, year or day), resulting in a most unusual time scale. 3) Evening in Hebrew means when the sun goes down. Morning means first light, when the sun comes up, until midday when the sun is at its zenith. Afternoon, when the day starts to fade, is not part of the equation. 4) One evening-morning is therefore 18/24 hours = ¾ of a day. 2300 evening-morning x ¾ = 1725 days. This literal interpretation does not necessarily deviate from Hebrew usage (Dan. 8:14, 26; cf. Ex. 16:8-13; 1 Kings 17:6).
Day of the LORD: 1,725 days - (1,260 days + 360 days) = 105 days or 3½ months. In other words, 1,725 days - (360 days + 105 days) = 1,260 days of the second half of the Tribulation (Dan. 8:13, 14). I believe the duration of the Tribulation to be 7 years or 2520 days. The length of both trumpet blast and plague would then be in the vicinity of 180 days each, provided plague and trumpet blast are of the same length (180 days x 14 trumpet blasts/plagues = 2520 days). King of the South as part of Beast from the abyss will only start launching attacks on God’s people and the two prophets after the sixth trumpet blast (Dan. 7:25; 8:11-14; 11:40; cf. Rev. 9:4, 12, 13; 11:2-8, 14, 15). Trumpet blast 6&7: 180 days x 2 = 360 days.
3) The LORD’s Day: Jehovah’s Day = 105 days or 3½ months
(without sunrise or sunset) = 1 “day.” See Zech. 14:1, 6, 7.