Increase my script performance Google Sheets Script - arrays

Question

I created a function that whenever I run the AppendRow script every row that does not have a dot (".") at the AY column, an array with every information/column that I want from that sheet will be transfered to my main sheet that has around 13k rows atm.
Usually about 20-40 rows get pasted into the first sheet everyday and this script automatically re-arranges the columns to my main sheet.
PROBLEM:
The problem is that each row that gets appended to my main sheet takes around 8-15sec to get transfered and sometimes I get this "exceeded-maximum-execution-time" error thats its really annoying.
Is there any way to make my code run faster or maybe just a way to make the script run more than 5 minutes?
function AppendRow() {
var app = SpreadsheetApp;
var Sheet = app.getActiveSpreadsheet().getSheetByName("Sheet1");
var ss2017 = SpreadsheetApp.openById("");
var sheet2017 = ss2017.getSheetByName("2017");
var lastSourceRow = Sheet.getLastRow();
var lastSourceCol = Sheet.getLastColumn();
var sourceRange = Sheet.getRange(1, 1, lastSourceRow, lastSourceCol);
var sourceData = sourceRange.getValues();
var lenght = sourceData.length;
//Logger.log(lenght);
var time = new Date();
time = Utilities.formatDate(time, "GMT+01:00", "dd/MM/yy, HH:mm:ss");
for(i=5326;i<=lenght;i++)
//my i=5326 is just cuz I had already
// information on my sheet that was transfered before this script existed
{
var columnAY = Sheet.getRange(i,51).getValue();
var checkReservation = Sheet.getRange(i,2).getValue();
if(columnAY == ".")
{
}
else
{
var B = Sheet.getRange(i,2).getValue();
var F = Sheet.getRange(i,6).getValue();
var E = Sheet.getRange(i,5).getValue();
var K = Sheet.getRange(i,11).getValue();
var L = Sheet.getRange(i,12).getValue();
var V = Sheet.getRange(i,22).getValue();
var O = Sheet.getRange(i,15).getValue();
var P = Sheet.getRange(i,16).getValue();
var Q = Sheet.getRange(i,17).getValue();
var AF = Sheet.getRange(i,32).getValue();
var AG = Sheet.getRange(i,33).getValue();
var N = Sheet.getRange(i,14).getValue();
var AI = Sheet.getRange(i,35).getValue();
var AB = Sheet.getRange(i,28).getValue();
var AC = Sheet.getRange(i,29).getValue();
var array = ["",B,F,E,K,L,"",V,O,P,Q,AF,AG,"","",N,N,AI,"","",AB,AC,"","","","",time];
sheet2017.appendRow(array);
Sheet.getRange(i,51).setValue(".");
}
}
}
p.s.: I also have a menu in my spreadsheet to run the script every time i want to not sure if that is any relevant to the question :P
function onOpen() {
var ui = SpreadsheetApp.getUi();
ui.createMenu('My Menu')
.addItem('Copy to 2017', 'AppendRow')
.addToUi();
Every comment is appreciated !! :)

Answer 1

I must admit to having a bit of a problem figure out how my i's coordinated with your's but I think my columns are correct. So check it out but this should run a bit faster.
function AppendRow()
{
var ss0=SpreadsheetApp.getActive();
var sh0=ss.getSheetByName('Sheet1');
var rg0=sh0.getDataRange();
var vA0=rg0.getValues();
var ss1=SpreadsheetApp.openById(id);
var sh1=ss1.getSheetByName('2017');
var TimeStamp=Utilities.formatDate(new Date(), Session.getScriptTimeZone(), "dd/MM/yy HH:mm:ss");
for(i=5326;i<vA0.length;i++)
{
var columnAY=vA0[i][50];
var checkReservation=vA0[i][1];
if(vA0[i][50]!='.')
{
var B = vA0[i][1];//Sheet.getRange(i,2).getValue();
var F = vA0[i][5];//Sheet.getRange(i,6).getValue();
var E = vA0[i][4];//Sheet.getRange(i,5).getValue();
var K = vA0[i][10];//Sheet.getRange(i,11).getValue();
var L = vA0[i][11];//Sheet.getRange(i,12).getValue();
var V = vA0[i][21];//Sheet.getRange(i,22).getValue();
var O = vA0[i][14];//Sheet.getRange(i,15).getValue();
var P = vA0[i][15];//Sheet.getRange(i,16).getValue();
var Q = vA0[i][16];//Sheet.getRange(i,17).getValue();
var AF = vA0[i][31];//Sheet.getRange(i,32).getValue();
var AG = vA0[i][32];//Sheet.getRange(i,33).getValue();
var N = vA0[i][13];//Sheet.getRange(i,14).getValue();
var AI = vA0[i][34];//Sheet.getRange(i,35).getValue();
var AB = vA0[i][27];//Sheet.getRange(i,28).getValue();
var AC = vA0[i][28];//Sheet.getRange(i,29).getValue();
var array = ["",B,F,E,K,L,"",V,O,P,Q,AF,AG,"","",N,N,AI,"","",AB,AC,"","","","",TimeStamp];
sh1.appendRow(array);
sh0.getRange(i+1,51).setValue(".");
}
}
}