yeah two beers, if your mash tun is big enough, 35-55L, brew partigyle
run out and boil the IPA, add some crystal and choc malt etc to the mash tun, recharge with mash liquor then when running out the IPA from the kettle run out the bitter from the mash tun, boil with the hops from the first beer, add flavcor/aroma hops, two beers from an only slightly longer than normal brewday
Jovial Monk