Initial

index.js

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+//calculate time remaining between now and completion in arbitrary amounts
+class TimeToComplete {
+  constructor(destination) {
+    this.destination = destination || 100;
+    this.last = 0;
+    this.lastTime = Date.now();
+  }
+
+  //calculate time remaining;
+  remaining(current, consoleLogProgress = false) {
+    const now = Date.now();
+    const timeDifference = this.lastTime - now;
+    const difference = (this.destination) / (this.last - current);
+
+    const timeToComplete = timeDifference * difference;
+
+    const seconds = Math.abs(timeToComplete / 1000);
+    const minutes = Math.abs(timeToComplete / 1000 / 60);
+    const hours = Math.abs(timeToComplete / 1000 / 60 / 60);
+
+    if (consoleLogProgress) {
+      console.log(`This process should be done in ${seconds} seconds.`)
+      console.log(`This process should be done in ${minutes} minutes.`)
+      console.log(`This process should be done in ${hours} hours.`)
+    }
+
+    //set for next run;
+    this.lastTime = now;
+    this.last = current
+    return {
+      seconds,
+      minutes,
+      hours
+    }
+  }
+}
+
+const time = new TimeToComplete(100);
+
+setTimeout(() => {
+  time.remaining(40, true);
+}, 1000)
+
+setTimeout(() => {
+  time.remaining(44, true);
+}, 2000)

package.json

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+{
+  "name": "timetocomplete",
+  "version": "1.0.0",
+  "description": "A package that'll help you determin how long a process is going to take to complete",
+  "main": "index.js",
+  "scripts": {
+    "test": "npm test"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+ssh://git@github.com/Streek/TimeToComplete.git"
+  },
+  "author": "Keith Connolly",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/Streek/TimeToComplete/issues"
+  },
+  "homepage": "https://github.com/Streek/TimeToComplete#readme"
+}

readme.md

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+# TimeToComplete
+
+This library exported as a class module.
+
+## Download
+
+ * [Master build](https://github.com/Streek/TimeToComplete)
+ * [1.0 build](https://github.com/Streek/TimeToComplete/releases)
+
+TimeToComplete is released under the [MIT license](https://raw.githubusercontent.com/streek/TimeToComplete/LICENSE) & supports modern environments.
+
+## Installation
+
+In a browser:
+```html
+<script src="TimeToComplete/index.js"></script>
+```
+
+Using npm:
+```shell
+$ npm i -g npm
+$ npm i --save TimeToComplete
+```
+
+In Node.js:
+```js
+// Load the full build.
+const timeClass = require('TimeToComplete');
+const time = new timeClass;
+```