It varies from TOC to TOC, then further depends on what mood they are in.
I've done two ALRs this year. I claimed from the same TOC twice. The first time, they assumed that like a season ticket, one does 10 journeys per week. The ticket was £680, so 30 minute delays were worth £34, 60 minutes was £68 and 120+ minutes was £136.
The second time they said that although the delay was caused by the railway industry and they could see I had been compensated for a delay a few months earlier using another ALR, that this time around they were not willing to provide any compensation because I was not entitled to any when using a Rover ticket.
A few TOCs follow the calculations given above, or a very similar one which assumes 10.5 journeys per week, i.e one weekend trip every 4 weeks.
Some went by the FDS/FOS price.
Some as the appropriate percentage of the FDR/FOR.
Some saw the journey I was claiming for, equated the day's Rover value to the weekly season ticket between those two stations, thereafter using their standard procedure to calculate the compensation amount.
It's pot luck, you are not entitled to anything if using a Rover but best to apply and see what happens. I sent my ALR off to one TOC, requesting to have it returned. It came back with most of the orange strips turned to white. No idea how they managed that, but the texture was the same and the text hadn't faded.