Dose - 100 mg in one day?

[cobetcknncoio3]

swim uses adderall recreationally regularly, maybe once a week. however, he hasn't had any in about 3 weeks, and just recently got 100mg instant release adderall. the most he's ever taken at once was 50mg, but since it only lasts about 4 hours, would it be safe to take the second 50mg after the first dose wears off, leaving a grand total of 100mg amphetamine in one day? that way, swim would get the entire day speeding, instead of speeding the first half, then coming down the second half of the day. by the way, swim weighs 185 pounds.