I never usually limit myself on UP days but as its the School Hols I am far less active so Last week I kept my weekday UPs to 1800-2000 but I have never and hope never to, limit my weekends. At the beginning I think its best to concentrate on your DD s and let the UP s look after themselves, then when you have a good pattern going and are coping with the DD s, take a look at your losses and decide whether you need to rein in your UP s a bit or not. But it is important to eat your cals and not 'cut back' on UP s.