Need Advice on Routine

[cgeorgemeow]

Stats
Height: 6ft
Weight:240lbs
Body Fat Percentage:20%
Age:28
Been training heavy for 5 years

My question is this I am currently unemployed and about to take a job that is very labor intensive in the hot sun. I will be working as manual labor at a car wash since I cannot find any other work, the shifts can range from 4 to 5 hours to 12 or 13 hours straight with no breaks. My question is this how can I still train and hit weights without loosing to much of my muscle mass. Should I change my routine to a 4 to 8 rep scheme or should I go with the flow since my job will be about 500 to a thousand reps a day and do volume, should I only hit weight 3 times a week because of the intensity of the work or stay with 4 that I do now. I just got out of a mass phase of my meso routine which lasted 12 weeks where I did reps of 4 to 8 with 3 working sets to put on some good quality mass. Right now I'm not yet in my cutting stage I have added cardio and jog 30 mins 4 days a week my reps are 8 to 10 with a warm up set of 12 with 4 sets and 4 exercises per body part.

Mass Routine 12 weeks
1 warm up set 10
3 sets of 4 to 8
4 exercises per body part
4 day split , 3 off
Day 1-Chest, Triceps
Day 2-Legs
Day 3-Back, Biceps
Day 4-Shoulders, Traps

In week 7 of current rep phase (Total would be 10 to 12 weeks)
1 warm up set of 12
3 working sets of 8 to 10
4 exercises per body part
4 days cardio 30mins jogging
Same spilt as above.

The last part of the phase(Total would be 8 to 10 weeks)
Would have been warm up set 15
3 working sets 12 to 15
Same split as above 5 days of cardio 45mins joggin

Well wondering what I should do?

[stack_it]

Day 1-Chest, Triceps
Day 2-Legs
Day 3-Back, Biceps
Day 4-Shoulders, Traps

In week 7 of current rep phase (Total would be 10 to 12 weeks)
1 warm up set of 12
3 working sets of 8 to 10
4 exercises per body part
4 days cardio 30mins jogging
Same spilt as above.

I would stick to this. All you will lose from the heat is water weight. Just keep hydrated. I think you'll be surprised to learn that the job isn't as labor intensive as you think. If you're worried about it the your diet would be what needs to be adjusted not your routine. Just up your calories to make up for the extra ones being burned at work.