Ahh right, I'm with you now. Well you could just quintuple what you eat for your 2m commute
How long is a piece of string? Assuming a 150w avg = 540cals/hr, 200w=720cals/hr. I'd also consider not just the amount of calories but reflect on the profile of your ride, if it's pretty flat and steady state and your HR stays mostly in your aerobic zone then you're not going to need 150g+ of carbs. Vs up and down steep rolling hills.
Equally it might be uphill on the way in and mostly flat on the way home. Or you might find a head/tail wind on some days. Or you draft a bus for 5 miles. This is why everyone should buy allllll the PM's
A safe bet would be 4-500cals extra each way assuming the amount of effort or work is similar on both stints. If you find you're slowly losing weight or not recovering then increase this. I wouldn't worry about gaining weight as being on the bike 2 hours every day it'll be easy enough to quickly create a deficit and shift any short term gain while you find the right balance.
I'd also not forget to address mobility & stretching work either as another 5-6 hours cycling a week will warrant it.
'Don't stand when you can sit, don't sit when you can lay, don't lay when you can sleep'
Try not to be overly active on rest & recovery days either